Several Republican senators were easily re-elected on Tuesday in US midterm elections that could usher in an era of divided government and reduce President Joe Biden’s power in Washington, Reuters reported.

With polls closed in six states, early results are unlikely to change the 50-50 balance of power in the Senate, which Democrats currently control by majority vote.

Edison Research predicts that incumbent Republican senators Tim Scott in South Carolina and Todd Young in Indiana will be re-elected. Fox News predicts Republican Rand Paul will be re-elected in Kentucky and Democrat Peter Welch will win the open Senate seat in Vermont.

Thirty-five seats in the Senate and all 435 seats in the House of Representatives are on the ballot.

Republicans are favored to pick up the five seats needed to control the House, but control of the Senate could come down to races in Pennsylvania, Nevada, Georgia and Arizona. About 36 gubernatorial elections have also been held.

The final result is unlikely to be known in the near future.

More than 46 million Americans voted by mail or in person before Election Day, according to data provided by the US Elections Project, and state election officials warn that it will take time to count all those ballots.

Control of the Senate may not be known until a possible Dec. 6 runoff election in Georgia.