Fundraising, polls and history were not on the president's side.
"In the end, we hold the House because of the strong economy", the Louisiana Republican told The Associated Press on the eve of Election Day.
While the economy continues to thrive, Trump has spent much of the campaign's final days railing against a caravan of Latin American immigrants seeking asylum at the USA border.
Long lines and malfunctioning machines marred the first hours of voting in some precincts, including in Georgia, where some voters reported waiting up to three hours to vote in a hotly contested gubernatorial election.
In addition to electing their lawmakers, Americans in several states will vote on ballot measures.
And on Monday, he made the case that if Democrats win, they will work to roll back everything he's tried to accomplish. Basically, what happened was the same slight error - the marginal underrepresentation of white working class voters favouring Trump - was replicated in a number of key districts located in states with large numbers of electoral college votes. Still, about two-thirds said economic conditions were good.More news: We will 'break sanctions proudly': Rouhani
Keeping control of the House would validate President Trump's governing style and mean full speed ahead for Hill Republicans to move his agenda.
GOP Whip Steve Scalise said the president's rallies were building momentum and with the economy a selling point, he predicted his party would retain a slim majority. The poll of likely voters found that 46% would choose the Republican candidate, while 45% would choose the Democrat.
He and the first lady were to host an evening watch party for family and friends.
Trump arrived in Fort Wayne, northeast of Indianapolis, where he brought Vice President Mike Pence and hoops coach Bobby Knight on Friday in yet another effort to defeat Sen.
'I won it by a lot [in 2016], Mike is going to have a big victory, ' Trump said. "I think he's trying to divide this country", said Hutchins, acting executive director of a group that advocates on labour issues. "I think he's preying upon people's fears". "Whether we consider it or not, the press is very much considering it a referendum on me and us as a movement". "I don't think Trump has done that at all". Florida has the longest coastline in the USA, but Florida's Republican candidate for governor, Mr Ron DeSantis, is a climate sceptic. "That's why our economy is growing like it is". This practice of manipulating constituency maps to gain political advantage was first practiced by MA governor Elbridge Gerry.
If Republicans hang on to their majorities in the House and Senate after two years of protests and marches against the Trump administration, it would be a crushing blow to Democrats.More news: Pakistan broadcaster misspells Beijing on live footage of Imran Khan’s speech
While Trump is not on the ballot, the most polarizing U.S. president for decades has put himself at the center of every issue.
Some Democrats have already vowed to force the release of his tax returns.
Analysts say the GOP is likely to remain in control of the Senate - but what kind of Senate will Mr. McConnell be leading?
But winning the popular vote will not necessarily be enough - just ask Hillary Clinton, who beat Trump by nearly three million votes but still lost the 2016 election. But Democrats are on offense in Nevada, the one competitive state that Clinton carried with a GOP Senate incumbent.
The demographic divides were coloring the political landscape in different ways.
Democrats boast record diversity on the ballot.
The Democrat is bidding to become the country's first African-American woman to win a governorship, and her race in Georgia could go to a runoff.More news: Baby plucked from sea by fisherman who thought it was a doll
Many of the Democratic candidates have military backgrounds and emerged as formidable challengers, particularly in red-state districts where Republicans have dominated.