A fourth defendant who allegedly conspired with associates of President Trump’s personal attorney, Rudy Giuliani, to illegally funnel foreign money into Republican campaigns, has turned himself in to authorities.

David Correia, 44, a Florida resident, surrendered at New York’s John F. Kennedy International Airport after returning from the Middle East. He appeared briefly in U.S. District Court in Manhattan on Wednesday and was released on $250,000 bond.

Correia’s arrest comes a week after Igor Fruman and Lev Parnas, who allegedly helped Giuliani in his efforts to dig up dirt on former Vice President Joe Biden and his son, Hunter, in Ukraine, were arrested at Dulles International Airport outside Washington as they tried to board a plane to Frankfurt, Germany, on one-way tickets.

Another man, Andrey Kukushkin, a Ukrainian-born California businessman, was arrested last week in San Francisco. Parnas was also born in Ukraine and Fruman in Belarus.

The Wall Street Journal reported earlier this week that Giuliani is a focus of the investigation.

In the grand jury indictment issued last week by Geoffrey Berman, the U.S. Attorney for the Southern District of New York, the two associates of Giuliani are accused of setting up a shell company, Global Energy Producers LLC, to hide the foreign sourcing of a $325,000 donation to America First Action, a pro-Trump super PAC. The alleged illegal transfer appears to have first been noticed last year by the non-profit watchdog Campaign Legal Center.

The indictment alleges the men “conspired to circumvent the federal laws against foreign influence by engaging in a scheme to funnel foreign money to candidates for federal and state office so that the defendants could buy potential influence with candidates, campaigns, and the candidates’ governments.”

Prosecutors say Correia, Parnas, Fruman and Kukushkin also made illegal contributions to local and federal politicians in New York, Nevada and other states to get support for a new recreational marijuana business.

Earlier this week, a grand jury issued a subpoena for former Texas Republican Rep. Pete Sessions, who is thought to be the “congressman-1” listed in the indictment. According to the indictment, Fruman and Parnas met with “congressman-1” during the 2018 campaign and pledged to raise $20,000 for him, possibly in exchange for “assistance” in removing then-U.S. Ambassador to Ukraine Marie Yovanovitch.

A spokesman for Sessions has said that the former congressman is cooperating with the investigation.

Yovanovitch, who was recalled from her post in May ahead of schedule, testified last week to House impeachment investigators as part of the Democrats’ impeachment inquiry of the president.

She reportedly told lawmakers that her departure came after Giuliani’s repeated criticisms of her. Giuliani has said, without evidence, that Yovanovitch as ambassador badmouthed Trump and sought to protect the Bidens, whom Trump and Giuliani, again without evidence, have accused of corruption over Hunter’s seat on the board of a Ukrainian energy company.

Giuliani, the former mayor of New York, has said he is unaware of any illegal campaign contributions by Parnas and Fruman and that he has not reviewed the evidence presented in their case.

In an undated photograph posted last July on the Facebook page of Ukraine’s chief rabbi, two men who appear to be Correia and Fruman pose flanking Trump at an America First Action event, all three smiling and giving the thumbs up.

Parnas and Correia are business partners in a firm called Fraud Guarantee, which advertises itself as helping investors “reduce the risk of fraud as well as [to] mitigate the damage caused by fraudulent acts,” according to its website. Parnas and Correia are listed as co-founders of the firm.

A brief biography on Fraud Guarantee’s website says Correia played professional golf for more than six years, worked in the commercial mortgage and lending industry and has “owned, operated and successfully sold nationally acclaimed restaurants” after which he “became intimately engaged in the Philadelphia residential real estate market as an investor.”

The Miami Herald, citing Florida corporate records, says Correia was listed as the secretary of a company called Parnas Holdings in 2012.

In an interview with the Herald, Dianne and Michael Pues, a New Jersey couple who say they are owed $500,000 after they invested in a failed movie venture by Parnas, allege that Correia once called them, issuing a veiled threat on behalf of his partner.

“He said we no longer knew who we were dealing with and that the Ukrainians had ties all the way up to the State Department and the White House and they were partners with Rudy Giuliani,” Dianne Pues said.

For the second time in seven years, Chicago Public Schools teachers will be on strike starting Thursday, walking out of class, they say, in the name of better schools.

Gathered on the stage of the union hall on Wednesday, the Chicago Teachers Union said its delegates were in full support of moving forward with a strike. Delegates had already authorized the walkout and set a date so it would have taken a reversal to cancel the strike.

“We have not achieved what we need to bring justice and high quality schools to the children and teachers of Chicago,” said CTU President Jesse Sharkey. “We need to have the tools we need to do the job at our schools. We need pay and benefits that will give us dignity and respect. We are on strike until we can do better.”

Altogether, more than 30,000 workers will be on the picket lines. This includes 7,500 teacher aides, custodians and security guards who members of SEIU Local 73. SEIU said Wednesday evening it had rejected CPS’ contract offer and planned to strike on Thursday along with CTU.

Officials say schools will be open, with principals and other administrators supervising any children that need a place to go. They also are telling parents they can bring their children to libraries and some community organizations.

Some 300,000 students who attend district-run schools will be impacted. Another 62,000 students who attend charter and contract schools run by private organizations will not be affected.

The two sides say they will be back at the negotiating table on Thursday, and will work toward reaching a deal.

Lightfoot announced Wednesday morning that she was cancelling school Thursday in anticipation of the strike. She said she expected the strike, painting it as a strike of choice. She said there has been some progress at the bargaining table, saying “At every turn, we bent over backwards to meet the unions’ needs.”

“I was disappointed by the CTU’s decision to begin a work stoppage and force the cancellation of classes because I feel like we rolled up our sleeves and negotiated in good faith over a long period of time,” she added Wednesday evening. “We offered a historic package on CTU’s core issues of compensation, staffing and class size.”

The union has yet to accept the school district’s salary and benefits offer, but the bargaining team has not been voicing major objections to the mayor’s proposal for teachers, which would provide 16% raises over five years and only minimally increase health care contributions.

When it comes to salary, it has focused on getting more money for veteran teachers and for office clerks and teacher aides, known as PSRPs.

However, the union’s most contentious asks have to do with creating better working environments for teachers and learning conditions for students.

The union sees this as a moment to win battles it has been fighting for years.

Since the current leadership took over the CTU in 2009, it has been pushing a focus on social justice issues, moving far beyond the traditional union bread and butter concerns. The idea of using teacher contracts to push for so-called “common good” issues has taken hold around the country.

In 2012, the union published a manifesto called the Schools Students Deserve that detailed the need for lower class sizes and more staff, such as librarians, social workers and counselors.

In the last two contract fights, the union brought up these issues, but they also had to concentrate on protecting their members whose jobs were being threatened by school closings and the opening of charter schools. The school district also had a budget deficit that made it difficult to argue for more resources.

This year, they saw an opening to try to win big on these social justice issues. The school district has more money after a change in the state’s funding formula and Lightfoot has said she believes schools need additional resources. The union also feels compelled to push these demands after years of budget cuts that led to staff losses in schools .

Many teachers say conditions in schools are unacceptable.

Lightfoot and her team have maintained they are committed to adding 250 more nurses, 200 social workers and more special education case managers to schools. But they say putting these promises in the contract would limit their flexibility.

For months, Lightfoot resisted putting enforceable class size caps, lowering class size limits and putting promises for more staff in the contract. She also has pointed out state law prohibits teachers from striking on issues outside of pay and benefits.

Then, in recent days, the union offered up a compromise. They said lower class size and increased staffing could apply to the neediest schools first.

And just Monday, Lightfoot changed her position and signaled she was willing to write into the contract some commitments on class size and staffing.

Speaking at a press conference Wednesday, Chicago Board of Education President Miguel del Valle argued that the union had essentially gotten what it wanted. “They were concerned about the staffing issues, they were concerned about class size,” he asked. “The mayor responded … what’s left?”

But the union maintains that, even this week, the offers being made by the school district don’t do enough to address their demands. They say they still want a nurse, librarian and a social worker in every school. They also want to lower counselor caseloads.

The union and school district say some tentative agreements have been reached, but many outstanding issues remain.

The union handed the school district 83 pages of demands on January 15. But talks did not begin in earnest until after Lightfoot took office in May.

The union’s contract expired on June 30.

Sarah Karp covers education for WBEZ. Follow her on Twitter at @WBEZeducation and @sskedreporter.