President Joe Biden, in a letter to congressional Democrats, stood firm against calls for him to drop his candidacy and called for an end to the intraparty drama that has torn apart Democrats since his dismal public debate performance.

Biden’s efforts to shore up a deeply anxious Democratic Party came Monday as lawmakers returned to Washington confronting a choice: Decide whether to work to revive his campaign or try to edge out the party leader, a make-or-break time for his reelection and their own political futures.

Biden wrote in the two-page letter that “the question of how to move forward has been well-aired for over a week now. And it’s time for it to end.” He stressed that the party has “one job,” which is to defeat presumptive Republican presidential nominee Donald Trump in November.

“We have 42 days to the Democratic Convention and 119 days to the general election,” Biden said in the letter, distributed by his reelection campaign. “Any weakening of resolve or lack of clarity about the task ahead only helps Trump and hurts us. It’s time to come together, move forward as a unified party, and defeat Donald Trump.”

Anxiety is running high as top-ranking Democratic lawmakers are joining calls for Biden to step aside despite his defiance. At the same time, some of the president’s most staunch supporters are redoubling the fight for Biden’s presidency, insisting there’s no one better to beat Trump in what many see as among the most important elections of a lifetime.

Biden followed up the letter with a phone interview with MSNBC’s “Morning Joe” show, on which he insisted that “average Democrats” want him to stay in the race and said he was “frustrated” by the calls from party officials for him to step aside.

“They’re big names, but I don’t care what those big names think,” Biden said.

He threw the gauntlet at his critics, saying if they’re serious they ought to “announce for president, challenge me at the convention” or rally behind him against Trump.

Democratic voters are split on whether Biden should remain the Democratic Party’s nominee for president, or whether there should be a different Democratic nominee, according to a New York Times/Siena College poll.

As lawmakers weigh whether Biden should stay or go, there appear to be no easy answers.

It’s a tenuous and highly volatile juncture for the president’s party. Democrats who have worked alongside Biden for years — if not decades — and cherished his life’s work on policy priorities are now entertaining uncomfortable questions about his political future. And it’s unfolding as Biden hosts world leaders for the NATO summit this week in Washington.

Time is not on their side, almost a month from the Democratic National Convention and just a week before Republicans gather in Milwaukee to renominate Trump as their presidential pick. Many Democrats are arguing the attention needs to be focused not on Biden but on the former president’s felony conviction in the hush money case and pending federal charges in his effort to overturn the 2020 election.

It’s what Biden himself might call an inflection point. As he defiantly says he will only step aside if the Lord almighty comes and tells him to, Democrats in the House and Senate are deciding how hard they want to fight the president to change his course, or if they want to change course at all.

In an effort to “get on the same page,” House Democratic leader Hakeem Jeffries is convening lawmakers for private meetings before he shows his own preference, according to a person familiar with the situation and granted anonymity to discuss it. He planned to gather Democrats on Monday whose bids for reelection are most vulnerable.

A private call Sunday including some 15 top House committee members exposed the deepening divide as at least four more Democrats — Rep. Jerrold Nadler of New York, Rep. Jim Himes of Connecticut, Rep. Adam Smith of Washington state and Rep. Mark Takano of California — privately said Biden should step aside.