Republicans win control of US Senate, make gains in House

Republicans have won control of the US Senate with victories in Montana, Ohio and West Virginia, ensuring Donald Trump's party will control at least one chamber of Congress next year.

Republicans were set to hold a majority of at least 52-48 in the US Senate and had added three seats to their 220-212 House of Representatives majority, though with 51 of the 435 races yet uncalled, final control of the lower chamber was yet unclear.

If Republicans ultimately prevail in the House, they would be in a position to dictate the agenda in Washington, helping Mr Trump deliver on his promise to slash taxes and restrict immigration, for at least the next two years until the 2026 midterm elections.

The results also ensured Republicans in the Senate would be able to help Mr Trump appoint conservative judges and other government personnel.

Republican Tim Sheehy unseated Democratic US Senator Jon Tester in Montana and Republican West Virginia Governor Jim Justice won an open Senate seat in the state shortly after polls closed, taking over the seat previously held by Joe Manchin, a Democrat-turned-independent.

In Ohio, Republican Bernie Moreno was projected to defeat third-term incumbent Democrat Sherrod Brown.

Republicans stood a chance to widen their Senate majority further, as their candidates were leading Democratic incumbents in Pennsylvania and Nevada.

Regardless, Republicans will not secure the 60-vote majority needed to advance most legislation in the chamber.

The Senate was set to see two Black women serving simultaneously for the first time, as Democrat Lisa Blunt Rochester won in Delaware, and Democrat Angela Alsobrooks won in Maryland.

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Republicans also won several races that could allow them to expand their 220-212 majority in the House, though the final outcome may not be known for days.

They won a Democratic-held district in Pennsylvania that includes Scranton, Democratic President Joe Biden's hometown, and picked up seats from Democrats in North Carolina, where they had redrawn district lines to their advantage, with another victory in Michigan.

Democrats won a Republican-held seat in upstate New York and a seat in Alabama that had been redrawn to comply with a US Supreme Court order to create a Black majority district.

Democrats now need to flip at least seven seats to take control of the 435-seat chamber.

However their opportunities to do so were gradually diminishing, as Republican incumbents won competitive reelection races in Colorado, Iowa, New Jersey and Virginia.

In Delaware, voters made history by electing Democrat Sarah McBride, the first openly transgender member of Congress.

With at least 200 seats safe for each party, the winning side will likely end up with a narrow majority that could make governing difficult.

That has been evident in the past two years as Republican infighting has led to failed votes and leadership turmoil and undercut the party's efforts to cut spending and tighten immigration.

Tight races in the heavily Democratic states of New York and California could determine House control, and California typically takes several days to count its ballots.