Keeping the House would give Republicans the power to ram through policies like tax cuts, energy deregulation and border security controls.

Political control of the Arizona Senate was on the ballot Tuesday. Counting by the end of the week has revealed a trendline that favors Republicans retaining control of the 30-member chamber, although hundreds of thousands of ballots remain to be counted.

Republicans inched toward a House of Representatives majority as more races were decided in their favor, and Democrats looked to pick up key races to tighten the match.

Donald Trump's Republicans held on to a narrow edge on Friday as election officials tallied the final votes that will determine control of the U.S. House of Representatives, though Democrats succeeded in flipping a pair of New York state seats.

Republicans have won control of the Senate, a major boost for President-elect Donald Trump to enact his agenda, confirm his Cabinet officials and secure lifetime appointments for federal judges, including any potential openings on the U.

Control of the US House continued to teeter on uncounted votes in about 30 congressional races Thursday, and the final tally will decide whether President-elect Donald Trump and Republicans have full grip on the government.