Pointing to expected voting problems this year because of the coronavirus pandemic, left-leaning groups have filed a federal lawsuit challenging parts of Florida's rules for vote-by-mail ballots.

Priorities USA, Alianza for Progress, the Florida Alliance for Retired Americans and individual plaintiffs filed the lawsuit Monday, almost exactly six months before the Nov. 3 general election. The lawsuit challenges state laws and procedures that include requiring elections supervisors to receive vote-by-mail ballots by 7 p.m. on election night for the ballots to count.

The lawsuit argues that ballots should be valid so long as they are postmarked on or before Election Day.