But with his party losing its majority in the House, the results represented a bitter setback for Trump after a campaign that became a referendum on his leadership.
The party needed a net gain of 23 seats to break the Republicans' eight-year hold on the House and place a check on President Donald Trump. Fox and NBC television networks called the result in the US House of Representatives, while confirming expectations that Trump´s Republicans will retain control of the Senate.
A simple House majority would be enough to impeach Trump if evidence surfaces he obstructed justice or that his 2016 campaign colluded with Russian Federation.
Trump has already been trying out defensive arguments, noting that midterm losses are typical for the party in the White House, pointing out a high number of GOP retirements and stressing that he has kept his focus on the Senate. Moscow denies meddling and Trump denies any collusion.
"Tremendous success tonight. Thank you to all!" he tweeted.
He said, "All the accusations that we will be meddling in today's elections turned out to be empty statements".
Former vice president Joe Biden, often touted as a possible Democratic candidate to take on Trump in 2020, said he'd be "dumbfounded" not to win the House.
Democrat Jennifer Wexton speaks at her election night party after winning in Virginia.
While some election forecasts favored Democrats, Rasmussen, the pollster that most accurately predicted Trump's 2016 victory, had the two parties locked in a statistical tie on a generic ballot.
Midterm elections are typically hard for the party in power, and GOP incumbents were on defense in races across the country.
At stake are all 435 seats in the US House of Representatives and 35 of the 100 seats in the Senate. Many of those seats flipped to the Democrats, a large chunk of their new majority. Of the three races he targeted in the final day, the Republicans won all of them: Mike Braun defeated Democratic Sen.
That wide difference in Trump's national vs. his key state approval helps explain the dual storyline emerging on election night of Democratic pickups giving them control of the US House and Republican success holding control of the US Senate by picking off Democratic senators representing states Trump won in 2016.
Some of the biggest Democratic stars of the campaign lost. Both Republicans Rick Scott in the Senate race and Ron DeSantis in the governor's race hold leads in Florida.
Anxious Republicans privately expressed confidence in their narrow Senate majority but feared the House could slip away.
Senators Bernie Sanders of Vermont, a 2016 Democratic presidential contender, and Tim Kaine of Virginia, Hillary Clinton's vice presidential nominee in 2016, easily won re-election. Democratic Sen. Sherrod Brown was projected to hold his seat in Ohio.
Tuesday's elections will determine control of Congress in the final two years of Trump's term, and about 7 in 10 in voters said which party will hold control was very important as they considered their vote.
"With Democrats' leadership in the state solidified, NY can pass policies previously blocked by Republicans to expand health care coverage, address climate change, and ensure women retain the right to make their own medical decisions", Jessica Post, executive director for the Democratic Legislative Campaign Committee, said in a statement on Tuesday.
"We need to keep the Senate Republican to support the agenda of Donald Trump", he said.
In suburban areas where key House races were decided, voters skewed significantly toward Democrats by a almost 10-point margin.
The crucial polls, marking the first major voter test of Trump, is seen as a referendum on his controversial policies, including those on immigration.
Democratic Rep. Jerrold Nadler, who is slated to steer the House Judiciary Committee warned that the election was about accountability for Trump.