Florida Democrats say they've filed a federal lawsuit asking for the state's early voting period to be extended.
Republican Gov. Rick Scott has stood firm against giving Florida residents more time to vote before Tuesday.
On Saturday, some Floridians waited for hours on the last day of early voting. State officials say nearly 4 million early and absentee votes have been cast.
Scott and state officials have insisted there were no reasons to keep polls open beyond the eight days authorized in state law. The GOP-controlled Florida Legislature last year cut the number of early-voting days from a maximum of 14 days to eight. That reduction was upheld by federal courts.
State Democrats are citing "unprecedented voter turnout" in asking that "more Floridians have a meaningful change to vote early."