Biden, an 81-year-old Democrat who was in a tight race with Republican challenger Donald Trump, endorsed Harris when he ended his reelection bid on Sunday.
'Brazen money grab'The Trump campaign argued that Harris undertook a "brazen money grab," according to the filing by David Warrington, the campaign's general counsel.
US PRESIDENT Joe Biden delivers the State of the Union address, as Vice President Kamala Harris applauds, last year.
In any case, election regulators are unlikely to resolve the issue before the Nov. 5 presidential election.
Harris' campaign has said it had raised $100 million since Sunday, when Biden stepped back from the campaign and endorsed her - exceeding Biden's remaining tally in just a few days.

Trump campaign files complaint against Harris taking over Biden war chest