Democrats seized control of the House of Representatives on Tuesday in a midterm setback for Donald Trump, but the US president managed to avoid a feared "blue wave" as his Republican Party expanded its Senate majority after a polarizing, racially charged campaign.
Heralded by Trump as a "tremendous success," the Republican Senate victories will all but end any immediate talk of impeachment, even as the Democratic-led House will enjoy investigative powers to put new checks on his roller-coaster presidency.
Just after polls closed on the West Coast, Trump took to Twitter to hail his party's performance.
But network projections said that Democrats would take control of the House for the first time in eight years, upending the balance of power in Washington where Trump enjoyed an easy ride following his shock 2016 election with Republican dominance of both chambers.
Democrats were on course to flip at least 26 seats from Republican hands, with strong performances among suburban white women who had narrowly turned to Trump two years ago and in key battleground states such as Pennsylvania.