The Republicans have won back control of the US House of Representatives.
After two years of Democratic control of both the House and the Senate, the power dynamic in Washington will now shift.
It means Joe Biden’s administration could struggle to enact parts of its legislative agenda.
The Democrats did manage to keep control of the Senate after a key victory in the state of Nevada.
But the Republicans picked up enough seats to reach the 218-seat majority needed to win the House, NBC projections show. However, the Democrats’ fear of a “red wave” of victory was averted.
The expected surge of support towards the Republican Party, many of whose candidates were endorsed by Donald Trump, failed to materialise and it leaves them with a razor-thin majority.
Senator Mitch McConnell was also re-elected as Republican leader, quashing a challenge from Senator Rick Scott of Florida.
President Joe Biden congratulated him on the party’s control of the House and said he was “ready to work with House Republicans to deliver results for working families”.
He added: “In this election, voters spoke clearly about their concerns: the need to lower costs, protect the right to choose, and preserve our democracy.
“As I said last week, the future is too promising to be trapped in political warfare.
“The American people want us to get things done for them. They want us to focus on the issues that matter to them and on making their lives better. And I will work with anyone – Republican or Democrat – willing to work with me to deliver results for them.”
The party in power almost always suffers losses in a president’s first midterm elections, and soaring inflation and concerns about the economy have been big factors in Mr Biden’s low approval ratings.