On the morning of July 22, local time, U.S. Vice President Harris delivered a speech at an event at the White House. This was Harris' first public appearance after U.S. President Biden announced on July 21 that he would withdraw from the 2024 presidential election and fully support the nomination of Harris as the Democratic presidential candidate.

So far, almost all Democrats who are seen as Harris' "potential challengers" have expressed their support for her, including the governors of Michigan, California, and Kentucky. However, former President Obama, U.S. Senate Majority Leader Schumer and other party "bigwigs" have not yet publicly expressed their approval of Harris. Some congressional Democrats have also suggested that a small primary should be held before the Democratic National Convention in August. The Democratic National Convention was originally scheduled to be held in Chicago from August 19 to 22, when the party's presidential candidate would be formally nominated. Before Biden withdrew from the election, the Democratic Party had planned to nominate Biden through remote voting before the convention. The convention rules committee is scheduled to finalize the nomination process this week. It is not clear what adjustments will be made due to Biden's withdrawal.

According to U.S. media reports, in order to consolidate support within the party, Harris' team and its allies made hundreds of calls on the 21st to win the support of Democrats for her and try to obstruct possible challengers. Some key figures in the party believe that Harris should demonstrate her strength to the American people, donors and skeptics through a "micro-primary", that is, a quick primary campaign, while giving potential opponents a chance to compete. It is worth mentioning that it is not only the Democratic Party that is having a headache right now, but the Trump team is also facing new challenges: Biden's age and ability to govern could have been constantly attacked, but now the target of attack has suddenly changed and it is still uncertain who it is. In response, Trump "claimed compensation" on social media. He said that the campaign team was forced to spend time and money to fight Biden, and Biden withdrew from the election, so they had to start over. "Shouldn't the Republicans be compensated for being deceived?"