The Republican Party is set to win a majority in the House of Representatives, giving Donald Trump effective control of both houses of Congress when he takes office in January.

Donald Trump won Arizona, the final state to be called in the US presidential election, marking a clean sweep of all seven battleground states.

Data provider Decision Desk HQ projected on Monday that President-elect Donald Trump's Republican Party had won a majority in the U.S. House of Representatives, which would signal that Republicans would hold a majority in both chambers of Congress.

Votes are still being counted in key U.S. House races, but according to CBS News projections, it looks like President-elect Donald Trump will take office with the Republicans holding majorities in both chambers of Congress.

Republicans are projected to keep control of the House of Representatives, handing the party total control of Washington with President-elect Trump back in the White House in January. Decision Desk HQ projected the GOP would hold the House by winning its 218th seat on Monday,

Data provider DDHQ projected on Monday that President-elect Donald Trump's Republican Party had won a majority in the U.S. House of Representatives, which would signal that Republicans would hold a majority in both chambers of Congress.

Republicans had already secured a U.S. Senate majority of at least 52-46, Edison Research projected, and DDHQ projected they would hold at least 218 seats in the House of Representatives, with eight races yet to be called in Tuesday's election.

Republicans on Saturday were close to clinching control of the U.S. House of Representatives, a critical element for President-elect Donald Trump to advance his agenda when he returns to the White House in January.