Millions of people have cast ballots in two runoff elections in the US state of Georgia that will determine the balance of power in Congress. President-elect Joe Biden's Democratic Party is hoping to gain control of the Senate for the first time in years.
Polling stations were set to begin closing at 7 p.m. local time, although many people opted for advance voting due to the pandemic.
If Democrats win both races, it would allow Kamala Harris to cast the deciding vote in the chamber as vice president.
If Republicans win either seat, the party would retain a slim majority and could block Biden's legislative agenda.
The Democrats maintained control of the House in the November elections.
Biden called for Democratic support at a rally in Atlanta on Monday. He once again criticized Trump's handling of the coronavirus, and pledged to speed up vaccinations.
Biden said, "President spends more time whining and complaining than doing something about the problem. I don't know why he still wants the job. He doesn't want to do the work."
Trump also held a rally in the state, attacking Biden and stoking fears over the Democrats' immigration policies.
"They'll throw open American borders and allow tens and millions of illegal immigrants to pour into our country from every corner of the globe," Trump said.
The results may not be known for several days because of the high number of mail-in ballots.
This comes as members of Congress prepare on Wednesday to certify the outcome of another race -- the November presidential election. A growing number of Republicans have suggested they will raise objections.