WASHINGTON — The Supreme Court on Thursday put on hold the Trump administration's plan to add a citizenship question to the 2020 Census form sent to every household, saying it had provided a "contrived" reason for wanting the information.

Chief Justice John Roberts wrote the splintered opinion in the case, Department of Commerce v. New York. In a section the court's liberals agreed with, he said the Commerce Department must provide a clearer explanation.

Agencies must offer "genuine justifications for important decisions, reasons that can be scrutinized by courts and the interested public," Roberts wrote. "Accepting contrived reasons would defeat the purpose of the enterprise. If judicial review is to be more than an empty ritual, it must demand something better than the explanation offered for the action taken in this case."

Roberts said a district judge was right to send the issue back to the Commerce Department for a better explanation.

Whether the department has time to come up with such an explanation and get judicial approval is unclear. The administration has said a decision was needed by the end of June to add such a question; other officials have said there is a fall deadline.

After Thursday's ruling was announced, President Donald Trump tweeted that he is inquiring as to whether the census may be delayed until the Supreme Court receives the necessary information to make a final decision on the matter.

"Can anyone really believe that as a great Country, we are not able (to) ask whether or not someone is a Citizen," Trump's tweet says. "Only in America!"

Those who challenged the citizenship question have said its addition to the form would result in an undercount of millions of people who fear acknowledging that a noncitizen is part of their household.

Roberts' bottom line — that a lower court was right to say Commerce Secretary Wilbur Ross had not provided an adequate explanation for adding the question — was joined by liberal Justices Ruth Bader Ginsburg, Stephen Breyer, Sonia Sotomayor and Elena Kagan.

In dissent, Justice Clarence Thomas said the Trump administration's inclusion of a citizenship question was well within the federal agency's discretion. The court, he wrote, had overstepped its role by digging into the rationale for the decision with "suspicion and distrust."

"For the first time ever, the court invalidates an agency action solely because it questions the sincerity of the agency's otherwise adequate rationale," wrote Thomas, who was joined by fellow conservative Justices Neil Gorsuch and Brett Kavanaugh.

Justice Samuel Alito added, "To put the point bluntly, the Federal Judiciary has no authority to stick its nose into the question of whether it is good policy to include a citizenship question on the census or whether the reasons given by Secretary Ross for that decision were his only reasons or his real reasons."

Groups who had opposed adding the question were pleased but cautious.

"On the census, the Trump administration's lies went so far that even this Supreme Court had to say no," said Michael Waldman, president of the liberal Brennan Center for Justice. "If this leads to a result with no citizenship question, that would be a very welcome outcome, and it would also preserve the status quo. This should have been an easy case, and in the end, it was."

A string of lower courts found that Ross violated federal law and regulations in attempting to include the question on the census. They rebutted his claim that the information was first requested by the Justice Department to enforce the Voting Rights Act, which protects minorities, and noted his consultations with immigration hard-liners in the White House beforehand.

What happens next was not immediately clear because the department had said it must know by the summer whether the question can be added.

Dale Ho, director of the ACLU's Voting Rights Project, said there is not enough time for the administration to try to come up with a new rationale for the question.

"If they try to do this over the weekend, it's a sign of cutting corners and not reasoned decision-making," Ho said. "There really is not time. If the administration tries to rush it, that's clearly a red flag."

DOJ spokeswoman Kelly Laco called the decision a disappointment but said in an email after the ruling that the government "will continue to defend this administration's lawful exercises of executive power."

The case was the most debated Trump administration initiative to reach the high court since last year's 5-4 decision upholding the president's ban on certain travelers from a group of mostly Muslim countries.

There was even more at stake here, and the debate was filled with partisan politics: An undercount estimated by census officials of more than 8 million people wouldmost affect states and urban areas with large Hispanic and immigrant populations, places that tend to vote for Democrats.

The decennial count of the nation's population determines the size of each state's congressional delegation, the number of votes it receives in the Electoral College and how the federal government allocates hundreds of billions of dollars.

Challengers included Democrat-led states and civil rights and immigrant rights organizations.

The lower courts have said Ross violated administrative law and the enumeration clause of the Constitution by proposing to ask the citizenship question of each household. Those are the issues that were at stake at the Supreme Court.

But discoveries in the case since the court heard oral arguments in the spring raised new issues.

Judges in Maryland and New York said they would consider new allegations regarding the claim that Ross' action violated equal protection guarantees and was part of a conspiracy to drive down the count of minorities.

The information came from the files of a deceased Republican political operative. Thomas Hofeller, who had been in touch with some census officials at the start of the Trump administration, wrote a memo that said adding the question might help Republicans and white voters in subsequent redistricting decisions based on the census data.

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