What was he thinking? That is the question many are asking on both sides of the political spectrum.

Chief Justice John Roberts repeatedly voted with the Supreme Court’s conservatives this term, except in one, and only one, 5-to-4 decision. Written by Roberts, the ruling blocked the addition of a citizenship question on the 2020 census, leaving an angry President Trump desperately trying to find a way around it.

It also left a lot of speculation about the motives of the chief justice.

For some conservatives, Roberts’ vote in the census case was another original sin, much like his vote in 2012 to uphold key provisions of Obamacare. The chairman of the American Conservative Union has even called for Roberts’ impeachment.

“I’m for impeaching the Chief Justice for lying to all of us about his support of the Constitution,” tweeted ACU Chairman Matt Schlapp. “He’s responsible for Robertscare and now he is angling for vast numbers of illegal residents to help Dems hold Congress.”

Curt Levey, president of the conservative Committee for Justice, doesn’t go that far, but he said the census decision means that “having a conservative majority on the court is still a dream rather than a reality.”

Yet even Levey concedes that Roberts has been a reliable conservative vote on the court. Indeed, Roberts racked up an 80% rate of agreement with the court’s other conservatives in all opinions, the same percentage as the court’s most conservative justice, Clarence Thomas.

As for liberal, and moderate advocates and activists, they were not exactly out there speaking about the chief justice in glowing terms. While relieved that the census looked — for now — immune to political machinations, they were infuriated by another, and perhaps even more important, Roberts opinion.

Traitor or agenda-driven conservative?

Writing for himself and the court’s four other conservatives, the chief justice slammed the door shut on court challenges to extreme partisan gerrymanders. The decision will allow many state legislatures unfettered discretion to draw congressional and state legislative district lines so as to entrench their own political power.

Because Republicans now control state legislatures in 30 states, versus 18 controlled by Democrats, the decision is a boon to GOP power. (There are 22 states completely controlled by Republicans, and 14 where Democrats have total control).

It isn’t just liberals who have pushed for some court supervision of extreme partisan gerrymandering in an era of computer-driven hyper-partisanship.

“There’s no doubt there’s an agenda here,” said Harvard Law professor Charles Fried, who served for four years in the Reagan administration as Solicitor General, the government’s chief advocate in the Supreme Court.

He and other Republican former officeholders filed a brief on behalf of those challenging extreme partisan gerrymanders. Alluding to Roberts’ famous confirmation hearing comment that the job of a judge is not to bat for one side but to “call balls and strikes,” Fried observes caustically, “This is not balls and strikes. This is a long term, shrewdly played, but persistent program.”

The agenda “is to get the law, whether it’s the courts, or the Constitution, or the legislators” out of regulating “anything to do with elections.”

Fried catalogs Roberts’ decisions in this regard. He wrote the court’s 5-to-4 decision striking down the Voting Rights Act, a law passed and re-enacted repeatedly by large and bipartisan congressional majorities. He wrote or participated in a series of decisions striking down longstanding, as well as newer, limits on campaign contributions, also enacted by Congress, and aimed at limiting the role of big money in politics.

And when the court, by a 5-to-4 vote, upheld independent redistricting commissions established by voter referenda, Roberts wrote the dissent. The decisive fifth vote in that case was Justice Anthony Kennedy, now retired, and Fried worries that the 2015 decision is now in peril, even though Roberts, in the gerrymandering decision, pointed to the commissions as “one way” to take redistricting out of the hands incumbents.

While Fried and others fret about what they see as Roberts’ deviousness, Roberts’ conservative critics are not the least bit appeased. They view him as something of a traitor, mainly for the Obamacare and census decisions.

Levey, of the Committee for Justice, sees Roberts as a man more concerned with his image than the law.

“He often does appear like he’s very focused on his legacy and on being popular rather than on doing what a judge should do,” Levey said, adding that “all the pressure from the mainstream media and the establishment is to move left.”

Motivated by a “Solomonic dogma”?

Others, like Josh Blackman, a constitutional law professor at Southwest College of Law Houston, have a different view. Though Roberts has been dubbed “the new swing justice,” in the wake of Kennedy’s retirement last year, Blackman thinks that is a misnomer.

He sees Kennedy and retired Justice Sandra Day O’Connor, as “actually somewhere in the middle,” whereas “Roberts is a solid conservative, but for whatever reason, in certain high-profile cases, he takes these very bizarre paths that no one else in the court goes along with.”

It is true that nobody on the court went along with all of Roberts reasoning in either the census case or the the Obamacare case.

“I think Roberts is motivated by some sort of Solomonic dogma, that in any given case of high note,” Blackman said, “that the correct decision is one where he splits the proverbial baby.”

Of course, chief justices, Republican and Democrat, liberal and conservative alike, have uniformly believed that they have a particular duty to maintain public confidence in the court as an institution.

For instance, in 2000, then-Chief Justice William Rehnquist, wrote the opinion upholding a decision he had long reviled, the decision that 34 years earlier required police to warn criminal suspects of their rights.

And, in the 1930s Chief Justice Charles Evans Hughes worked hard behind the scenes, on and off the court, to prevent President Franklin Roosevelt’s court-packing plan from becoming law. Some historians believe that he was even instrumental in persuading one justice to moderate his views to defuse the threat.

Today, Roberts faces similar threats: a president who openly and repeatedly castigates judges in partisan and even ethnic terms, and Democratic presidential contenders, who think the number of justices on the Supreme Court should be expanded by statute if the Democrats take control of the Senate. They argue that Republicans, by refusing for nearly a year to consider President Obama’s Supreme Court nominee, have so stacked the deck that the move is necessary.

As some who know Roberts observe, while this and other such proposals are still in their relative infancy, the chief justice cannot ignore the alarm bells. And he knows that if the court moves too far to the right and too fast, those bells will only ring louder.

The Justice Department announced a major shakeup Sunday in its team of lawyers involved in the ongoing legal battle over the citizenship question the Trump administration wants to add to the 2020 census forms.

“The Department of Justice is shifting these matters to a new team of Civil Division lawyers going forward,” said DOJ spokesperson Kerri Kupec in a written statement.

The new team is made up of both career and political appointee attorneys, including lawyers from the Consumer Protection Branch, a DOJ official tells NPR’s Carrie Johnson.

The Justice Department did not provide an explanation for the change or identify on the record which attorneys will no longer be working on the cases related to the census. But more details are expected Monday in court filings.

The move comes as the Trump administration continues its search for a new way to include the question — “Is this person a citizen of the United States?” — on forms for the upcoming national head count after the Supreme Court ruled last month to keep it off for now.

Days after the Supreme Court rejected the administration’s stated reason for adding the question, the Justice Department announced early last week that printing had started for paper census forms that do not include the question.

It looked as if a more than year-long legal battle was winding down. Justice Department attorneys, including U.S. Solicitor General Noel Francisco, had repeatedly emphasized in court the importance of finalizing the 2020 census forms by June 30, so that the paper questionnaires can be printed in time.

But tweets by President Trump signaled that he was determined to continue pushing for the question.

“We are absolutely moving forward, as we must, because of the importance of the answer to this question,” Trump tweeted on July 3.

The president’s comments caught the attention of U.S. District Judge George Hazel, who called for an emergency hearing by phone last week as part of the Maryland-based lawsuits. During the hearing, Hazel asked Joshua Gardner, a career DOJ attorney, to confirm again the administration’s plans after noting that Gardner has indicated just the day before that the administration was moving forward with printing forms without the citizenship question.

“The tweet this morning was the first I had heard of the president’s position on the issue,” said Gardner, who had stepped away from a planned vacation to join the teleconference according to a transcript. “I do not have a deeper understanding of what that means at this juncture other than what the president has tweeted. But, obviously, as you can imagine, I am doing my absolute best to figure out what’s going on.”

Speaking to reporters on Sunday, Trump said that his administration has “a couple of avenues” for getting a citizenship question onto the census.

“Our Attorney General is doing a fantastic job, in many ways, and I think he’s got it under control,” Trump said.

In her written statement, Kupec noted that the DOJ attorneys involved in the census cases “have consistently demonstrated the highest professionalism, integrity, and skill inside and outside the courtroom.”

“The Attorney General appreciates that service, thanks them for their work on these important matters, and is confident that the new team will carry on in the same exemplary fashion as the cases progress,” Kupec added.

NPR’s Carrie Johnson contributed reporting.