Experts said the litigation serves to drag out the vote count and postpone major media from declaring Biden the victor, which would have dire political implications for Trump. "The current legal maneuvering is mainly a way for the Trump campaign to try to extend the ball game in the long-shot hope that some serious anomaly will emerge," said Robert Yablon, a professor at the University of Wisconsin-Madison Law School. "As of now, we haven't seen any indication of systematic irregularities in the vote count."

The campaign is still challenging late arriving mail-in ballots in Pennsylvania, which according to media reports numbered in the hundreds so far, likely too few to have a meaningful impact.

In addition, it appears increasingly likely Biden can win the race even if he loses the state.

Danielle Lang, who advocates for voting rights at Campaign Legal Center, said Trump has a long history of attempting to whip up mistrust in our electoral system.

"Allegations of 'irregularities' -- backed up by lawsuits, even frivolous ones -- could potentially serve that narrative," she said.

Experts said the lawsuits and claims of fraud might be aimed at softening the sting of being bounced from office by calling the process into question.

"The litigation looks more like an effort to allow Trump to continue rhetorically attempting to delegitimize an electoral loss,” said Joshua Geltzer, a professor at Georgetown Law's Institute for Constitutional Advocacy & Protection.

(Reporting by Tom Hals in Wilmington, Delaware; Editing by Noeleen Walder and Aurora Ellis)