WASHINGTON—Republicans clinched control of the House more than a week after Election Day, with GOP lawmakers on course for another narrow majority that will test party unity as they work to pass President-elect Donald Trump’s second-term agenda.

Republicans won control of the House of Representatives on Wednesday, according to a projection by the Associated Press, handing the party a sweep and ushering in a new era in Washington. With the presidency,

U.S. President-elect Donald Trump's Republicans on Tuesday inched closer to winning a majority in the House of Representatives and with it full control of Congress, which would give Trump power to advance his agenda when he returns to the White House in January.

Republicans have officially won a full trifecta of power in Washington, D.C., following GOP victories in several key U.S. House contests.

It also leaves Democrats with less leverage to challenge policies they disagree with, though narrow margins mean Senate Republicans could still struggle to secure enough votes for

Republicans appear on track to maintain their control of the U.S. House of Representatives in the new year, though yet again a narrow majority looks likely to cause headaches for GOP leaders.