U.S. President Joe Biden walks across the South Lawn to board Marine One for travel to Nevada from the White House in Washington, U.S., July.15, 2024. / Reuters/Leah Millis

(Reuters) -Several of U.S. President Joe Biden's reelection campaign fundraisers are on hold, multiple Democratic sources involved in the events told Reuters on July.19, even as the Democratic Party planned to accelerate his nomination and he vowed to continue in the 2024 race.

Biden had planned to raise money in Austin, Denver and California next week, but these plans have been shelved, at least for now, the sources said. The president tested positive for COVID-19 on July.17 but said on July.19 he would return to the campaign trail next week.

Biden's campaign said his fundraisers would go ahead as planned. "Reuters' sourcing is incorrect, and we look forward to a robust fundraising schedule," campaign spokesman Kevin Munoz said on July.19.

A source familiar with the situation said former late-night comic David Letterman would headline a fundraiser for Biden at the home of Hawaii Governor Josh Green in about 10 days, a sign of forward movement for Biden.

A number of big donors are closing their checkbooks amid questions about whether Biden should remain at the top of Democratic Party ticket, the sources said, using their financial clout to tell Biden to drop out of the November.5 race, potentially in favor of Vice President Kamala Harris.

The campaign hoped to raise some $50 million in big-dollar donations in July for the Biden Victory fund but was on track for less than half that figure as of July.19, according to two sources familiar with the fundraising efforts.

"There are a lot of donors who have said they won't put another dime in this race. The question is if Biden stays in the race, will they come back?" said one major East Coast campaign financier.

Biden raised $28 million in one night in June at a Hollywood fundraiser that was hosted by the actor George Clooney, who later urged Biden to end his campaign.

Harris will talk to major donors on Friday at the request of advisers to the president, according to a source familiar with the plan.

Fundraising from megadonors was expected to drop from June to July due to many of these people taking vacations, a campaign official told Reuters on Friday. "This narrative that high-dollar fundraising has dried up is wrong," the official said.

The official noted that the campaign has 10 campaign fundraisers on the schedule for this month.

More than one in 10 congressional Democrats have now publicly called on the incumbent to drop out following a disastrous June debate against Republican Donald Trump that raised questions about Biden's ability to win or to carry out his duties for another four years.

NOMINATING PROCESS MOVES FORWARD

The official party process to nominate Biden is advancing.

The Democratic National Convention Rules Committee met on Friday to outline a virtual voting process to bring forward the official nomination of the 81-year-old before the party's in-person convention starts August.19 in Chicago. Officials argued an early nomination is needed to more easily comply with state election laws or risk being left off the November ballot.

“They're not risks that we as a party can or should take,” Dana Remus, Biden's former White House counsel, told the committee.

For a party already divided over Biden, with fresh calls on Friday from Democrats in Congress to leave, the early virtual vote is another point of controversy.

Critics argue it is a means of pushing Biden through early as the party's official nominee. Others, including DNC Chair Jaime Harrison, say it is necessary to deal with an Ohio law that could have kept Biden's name off ballots in the state if he wasn't nominated by August.7, prior to the convention in Chicago.

A member of the rules committee asked whether it was possible that another candidate could challenge Biden in a virtual vote. Leah Daughtry, the committee's co-chair, said any challenger would need the "verified support of hundreds of delegates."

"Such a challenge has never happened over the past half century of competitive primaries," Daughtry said.

It was unclear how the nominating process would unfold if Biden were to abandon his reelection bid. The committee is expected to meet again next week to finalize the plan.

Biden has been isolating since he tested positive for COVID this week and was believed to be taking calls to step aside seriously. Several Democratic officials think an exit is a matter of time, Reuters reported on July.18.

“The writing is on the wall,” said a Democratic donor on July.19.

Biden has insisted for weeks that he would stay in the race despite calls from heavyweights in his party to cede his position.

Trump, 78, accepted the Republican Party's nomination this week in Milwaukee, speaking before a rapt audience on July.18.

Some Democrats have begun advertising against Biden. Pass the Torch, a group that wants Biden to step down, has launched a TV ad to air in Washington and Rehoboth, Delaware, where Biden frequently vacations, and features Democratic voters from Pennsylvania urging Biden to "pass the torch."