The U.S. pushed for the World Health Organization (WHO) to “engage directly” with Taiwan in the fight against the coronavirus on Thursday, prompting a swift rebuke from Beijing’s ambassador to the United Nations health agency.

Andrew Bremberg, U.S. ambassador to the United Nations in Geneva, said it is a “technical imperative that WHO present visible public health data on Taiwan as an affected area and engage directly with Taiwan public health authorities on actions,” Reuters reported.

In response, China’s delegation expressed “strong dissatisfaction” that some countries had raised the issue of Taiwan’s participation at WHO.

Taiwan is not a member of the WHO due to China’s objections. Beijing considers self-governing Taiwan a wayward province to be brought under its control.

Separately, Taiwan’s Foreign Ministry spokeswoman, Joanne Ou, slammed China and the WHO for providing inaccurate information about the number of coronavirus cases in Taiwan. The WHO reported Tuesday that the island had 13 cases, when there were only 10 at that time.

Taiwan has temporarily suspended entry for all Chinese citizens who live in mainland China.

Biden acknowledged his disappointing performance only a few days before the Feb. 11 primary in New Hampshire. The former vice president trails Sanders in the Granite State, while Buttigieg and Warren are not far behind him, according to recent polling averages.

A strong New Hampshire performance could help Biden hold off Sanders in Nevada and South Carolina, the third and fourth early nominating states. Biden has led in most surveys of those states. On Tuesday, his campaign tried to convince donors that he will still win Nevada and South Carolina after the poor Iowa showing.

Biden questioned the qualifications of both Sanders and Buttigieg on Wednesday as he pushed to gain traction in New Hampshire. He contended Sanders, a self-described democratic socialist, would hurt congressional candidates in the general election because Republicans would associate them with the label.

“But if Sen. Sanders is the nominee for the party, every Democrat in America coming down the ballot in blue states, red states, purple states, in easy districts, in competitive ones. Every Democrat will have to carry the label Sen. Sanders has chosen for himself. He calls him — and I don’t criticize him — he calls himself a democratic socialist,” Biden said, while calling Sanders a “good man.”

It is unclear whether Sanders’ ideology would really damage other Democrats in November. Biden leads Trump by 6 percentage points in a hypothetical head-to-head matchup, while Sanders has a 4-percentage point edge, according to a recent NBC News/Wall Street Journal poll.

Biden also criticized Buttigieg — whom he called by his moniker of “Mayor Pete” — for characterizing the former vice president as part of a failed power structure in Washington, D.C. Biden highlighted what he considers some of his biggest achievements in the federal government, including the Affordable Care Act, the Paris climate accord and the Violence Against Women Act.

“Is he really saying the Obama-Biden administration was a failure? Pete, just say it out loud,” Biden said. “I have great respect for Mayor Pete and his service to this nation. But I do believe it’s a risk, to be just straight up with you, for this party to nominate someone who has never held an office higher than mayor of a town of 100,000 people in Indiana. I do believe it’s a risk.”

The Sanders and Buttigieg campaigns did not immediately respond to requests for comment.

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The U.S. is accepting four new planes carrying Americans being evacuated from Wuhan, China, the epicenter of a new coronavirus outbreak that has infected more than 24,300 people across the world, the Centers for Disease Control and Prevention said Wednesday.

The Americans will be quarantined at four different military bases across the U.S.: Camp Ashland in Nebraska; Travis Air Force Base in California; Marine Corps Air Station Miramar in San Diego; and Lackland Air Force Base in Texas.

The four latest evacuation flights come after the first government-chartered flight from Wuhan landed at March Air Reserve Base in Riverside, California, last week. The flight’s 195 passengers remain under quarantine at the base.

“This could be the beginning of what could be a long response,” Dr. Nancy Messonnier, director of the National Center for Immunization and Respiratory Diseases, said on a conference call with reporters.

CDC officials announced the mandatory quarantine orders last week. It is the first time the U.S. government has issued federal quarantine orders in 50 years, officials said.

“While we recognize this is an unprecedented action, we are facing an unprecedented public health threat,” Messonnier said last week.

CDC officials said there have been no new U.S. cases reported since confirming 11 infections earlier this week. Officials said 206 people have tested negative for the virus, while 76 possible cases are still awaiting results.

World Health Organization officials announced earlier Wednesday that the number of cases of the flu-like coronavirus surged in the last day, with more than 3,100 new patients confirmed in China. WHO Director-General Tedros Adhanom Ghebreyesus said at a news conference that the reported cases are “the most cases in a single day since the outbreak started” on Dec. 31.

Just 191 of the total cases are outside mainland China, and 80% of those cases are concentrated in Hubei province where the virus was first detected in the city of Wuhan, Tedros said. Of the cases outside of China, 31 spread through human-to-human contact, mostly from close friends or relatives who had recently been to China.

Infectious disease specialists and scientists say the virus may be more contagious than current data shows. Data on the virus is changing by the day, and some infectious disease specialists say it will take weeks before they can see just how contagious it is.

The respiratory illness is not yet considered a pandemic. According to WHO, a pandemic is “an epidemic occurring worldwide, or over a very wide area, crossing international boundaries and usually affecting a large number of people.”