Republicans have recaptured control of the U.S. Senate and expanded their edge in the House of Representatives, giving them a majority in both houses of Congress for the final two years of President Barack Obama’s presidency.

Democrats held 55 of the Senate’s 100 seats before Tuesday’s midterm elections, but Republicans gained at least seven seats with wins in Arkansas, Colorado, Iowa, Montana, North Carolina, South Dakota and West Virginia. As of Wednesday, three races were undecided: in Alaska, Louisiana and Virginia.

The results were a stinging rebuff to Obama, who was not on the ballot but said that his policies were. He planned a mid-afternoon news conference to discuss the results and invited congressional leaders to the White House for a Friday meeting to discuss legislative priorities.

A third of the Senate was up for reelection Tuesday, including the Kentucky seat held by Senate Republican Mitch McConnell. He easily defeated his Democratic opponent, Alison Lundergan Grimes, earning a sixth term in office and setting him up to become Senate majority leader in January.

McConnell promised to seek agreement with Obama on some issues. But, at an election night victory party, he also vowed to continue the Republican effort to diminish the size of the national government.

“Friends, this experiment with big government has lasted long enough,” he said. “It’s time to go in a new direction.”

Republicans also added at least 14 seats in the 435-member House, where they already held 233 seats. It will be the Republicans’ biggest majority since the 1940s.

In Colorado’s Senate race, incumbent Democrat Mark Udall was defeated by Republican challenger Cory Gardner.

“Tonight we shook up the Senate. You shook up the Senate,” Gardner told supporters. “We go to work to fix a Washington that is out of step, out of touch and out of time.”

A pledge to rein in the federal government helped propel Republican Senate candidate Joni Ernst to victory in Iowa. She said it was about “getting [federal] spending under control, keeping taxes low, and cutting red tape so businesses can grow and invest.”

Tuesday was not a clean sweep for Republicans, as Democrats held onto Senate seats in states such as New Hampshire, where Jeanne Shaheen won another term in office.

“I will work with anyone in the Senate – Democrat, Republican, Independent – to get things done,” she said.

In Louisiana, incumbent Democratic Senator Mary Landrieu will face Republican Bill Cassidy in a December 6 runoff, since neither won a majority of the votes.

Landrieu challenged her rival to a series of debates on issues including education, jobs and the economy, “Social Security and Medicare, health care, energy and the environment and, yes, international affairs and trade.”

In Virginia, Democratic incumbent Mark Warner, who had been favored to win, held only a one-point advantage over his Republican challenger. As of early Wednesday afternoon, Ed Gillespie had not conceded the race.   

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