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. The GOP's grip on high-profile governorships in Florida, Georgia and Wisconsin were at risk as well.
USA politics expert, Dr James D. Boys, speaking to LBC, said that is more likely that a Republican challenger will get in the way of Trump securing a second term in the White House. "His actions, his verbage, he's clearly the focal point", said Tim Phillips, president of the Koch-backed Americans for Prosperity, which has poured millions into certain races this cycle to help preserve the Republican majority.
Almost 40 percent of voters cast their ballots to express opposition to the president, according to AP VoteCast, a national survey of the electorate, while one-in-four said they voted to express support for Trump.
Overall, 6 in 10 voters said the country was headed in the wrong direction, but roughly that same number described the national economy as excellent or good.
He returned to the White House in the wee hours of the morning after headlining final campaign rallies in Ohio, Indiana and Missouri, and planned to spend Election Day at the White House but out of public view.
Democrats had a slight early turnout edge heading into Election Day, but Republicans stormed the polls a little hard than Democrats.
I have no doubt that putting Trump and goodness knows how many of his associates, cronies, hangers-on, and toadies through years of pointless hearings will be satisfying for some earnest partisans.
Democrats need a net gain of 23 seats to take control of the House.
All 435 seats in the US House are up for re-election.
Real Clear Politics now has Republicans expected to gain two Senate seats and Democrats slated to nab 27 House seats and 7 governorships.
Of course it is possible that again, undecided voters will break for Trump and the Republican vote will be higher than expected in today's midterm elections.
He and the first lady were to host an evening watch party for family and friends.
Pelosi was speaking with reporters when she was asked if she still had a "great deal of confidence" that the Democrats will seize control of one or both Houses of Congress.
The political and practical stakes were sky-high.
On Monday, Facebook, NBC and even the Mr Trump's favourite network, Fox News, announced they would stop broadcasting a 30-second ad paid for by his campaign, which featured an undocumented Mexican immigrant. Perhaps more important, they would claim subpoena power to investigate Trump's personal and professional shortcomings. He never did, and also declined to release his tax returns as president.
Trump campaigned in Indiana Monday, just three days after his last visit, in a desperate effort to take down a Democratic incumbent here. Democrats could also make significant progress in the investigations of Trump's possible collusion with Russian Federation and of his tax returns. He is bombarding the voters with tweets and speeches that make out the caravan as a bunch of criminals who threaten the safety of the United States, with particular emphasis on the welfare of women.
Republicans already hold the house in the Senate.
Tuesday's results will be colored by the dramatically different landscapes in the fight for the House and Senate.
The most recent record in voter turnout during congressional midterm elections, when the White House was not on the line, came in 1982, when 49 percent of the voting-age population showed up to vote, according to the US Census Bureau.
A Democratic majority in the House would nearly certainly bring an onslaught of investigations into Trump's businesses and his administration. Sherrod Brown is easily expected to win re-election even in a state Trump carried two years ago, but the open governor's race is a much tighter contest. Pinellas County Democrats joined forces to cross campaign with Congressman Charlie Crist, Attorney General candidate Sean Shaw, Florida House District 69 candidate Jennifer Webb and Senate District 24 candidate Lindsay Cross.
Thirty-six of the 50 USA states elect governors this year, including about 10 considered toss-ups.