WASHINGTON (AP) — President Donald Trump is for the first time floating a “delay” to the Nov. 3 presidential election, as he makes allegations that increased mail-in voting will result in fraud.

The dates of presidential elections — the Tuesday after the first Monday in November in every fourth year — are enshrined in federal law and would require an act of Congress to change. The Constitution makes no provisions for a delay to the Jan. 20, 2021 presidential inauguration.

Trump tweeted Thursday: “With Universal Mail-In Voting (not Absentee Voting, which is good), 2020 will be the most INACCURATE & FRAUDULENT Election in history. It will be a great embarrassment to the USA. Delay the Election until people can properly, securely and safely vote???”

There is no evidence of widespread voter fraud through mail-in voting, even in states with all-mail votes. Five states already rely exclusively on mail-in ballots, and they say they have necessary safeguards in place to ensure that a hostile foreign actor doesn’t disrupt the vote. Election security experts say that all forms of voter fraud are rare, including absentee balloting.

Trump has increasingly sought to cast doubt on November’s election and the expected surge in mail-in and absentee voting as a result of the coronavirus pandemic. And Trump has called remote voting options the “biggest risk” to his reelection. His campaign and the Republican Party have sued to combat the practice, which was once a significant advantage for the GOP.

Trump refused in an interview just weeks ago with Fox News to commit to accept the results of the upcoming White House election, recalling a similar threat he made weeks before the 2016 vote.

“I have to see. Look … I have to see,” Trump told moderator Chris Wallace during a wide-ranging interview on “Fox News Sunday.” “No, I’m not going to just say ‘yes.’ I’m not going to say ‘no,’ and I didn’t last time, either.”

Last month, Trump told supporters in Arizona that “This will be, in my opinion, the most corrupt election in the history of our country.”

Just months ago, in April, Trump had ruled out the prospect of trying to change the election. “I never even thought of changing the date of the election,” he said. “Why would I do that? November 3rd. It’s a good number. No, I look forward to that election.”

“I’m not thinking about it at all,” he added. “Not at all.”

Attorney General William Barr, speaking to a House committee earlier this week, claimed there was “a high risk” that mail-in voting would lead to “massive” fraud. He said he had no “reason to think” the upcoming election would be rigged. But he said he believed “if you have wholesale mail-in voting, it substantially increases the risk of fraud.”

During the hearing, Barr was asked about comments he made last month over foreign interference in the election through phony ballots. He said he didn’t have evidence that foreign countries could use them to change the outcome of an election. But he said it was “common sense” they would try.

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