Defying President Donald Trump, Vice President Mike Pence said Wednesday that he does not have the power to discard electoral votes that will make Democrat Joe Biden the next president on Jan. 20.

Pence said in a statement issued minutes before he was to begin presiding over a joint session of Congress to count those votes that it was “my considered judgement that my oath to support and defend the Constitution constrains me from claiming unilateral authority to determine which electoral votes should be counted and which should not.”

Read More: Trump denies Pence rebuffed his call to challenge election certification

In the days before the joint session, Trump has pressured his vice president to toss electors from battleground states that voted for Biden to overturn the will of voters in a desperate and futile bid to undo President-elect Joe Biden’s victory in the November election.

“If Mike Pence does the right thing we win the election,” Trump told thousands of supporters who rallied Wednesday on the Ellipse, just south of the White House, an hour before the count in Congress was to begin. Pence did not attend the event.

“All Vice President Pence has to do is send it back to the states to recertify and we become president and you are the happiest people,” Trump said, repeating a falsehood he has been promoting leading up to the congressional session.

Shortly before the 1 p.m. start of the joint session and even as Trump continued his verbal haranguing, Pence made clear in a three-page letter released to the media that he would follow the Constitution, not the commander in chief.

Read More: Congress set to confirm Biden’s electoral win over Trump

Pence has no unilateral power under the Constitution and congressional rules that govern the count. It is up to the House and Senate to voice objections, and states’ electors were chosen in accordance with state law, not fraudulently.

Beginning at 1 p.m., Pence began to open the certificates of the electoral votes from each state and present them to the appointed “tellers” from the House and Senate in alphabetical order. At the end of the count, Pence, seated on the House of Representatives’ rostrum, has the task of announcing who has won the majority of votes for both president and vice president.

Despite his largely ceremonial assignment, Pence has faced intense pressure from the president and legions of supporters who want the vice president to use the moment to overturn the will of the voters in a handful of battleground states.

Pence told Trump during their weekly lunch in the West Wing on Tuesday that he did not believe he had the power to unilaterally overturn electoral votes, according to a person briefed on the one-on-one conversation. This person was not authorized to publicly discuss the private discussion, which was first reported by The New York Times, and spoke on condition of anonymity.

Trump denied the report in a statement late Tuesday in which he continued to falsely assert Pence has powers he does not. But the vice president, whose office declined to discuss his plans, was not expected to deliver on Trump’s request to overturn the electors, acknowledging he has no such unilateral power.

Pence has spent hours with staff and the Senate parliamentarian to prepare for Wednesday’s joint session, including studying the Electoral Count Act of 1887, which governs the proceedings, and relevant legal opinions.

In fulfilling one of the few formal responsibilities of the vice presidency, Pence risks compromising his own political future. Pence is eyeing a run for the White House in 2024 and is banking on his years of loyalty to Trump, who could be a political kingmaker for years to come, to help him stand out in what is expected to be a crowded field.

Despite claims by Trump and his allies, there was not widespread fraud in the election. This has been confirmed by a range of election officials and by William Barr, who stepped down as attorney general last month. Neither Trump nor any of the lawmakers promising to object to the count have presented credible evidence that would change the outcome.

Nevertheless, more than 100 House Republicans and a dozen Senate Republicans have said they will challenge the electoral votes of at least one state. Majorities in both chambers are required to reject the will of voters, but enough Republican lawmakers have said they will join with Democrats to reject the last-ditch move by Trump’s allies.

Trump made clear at the rally that he was putting his faith in Pence. “Mike Pence is going to have to come through for us,” Trump said, “and if he doesn’t, it’s a sad day for our country.”

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