The Democrats therefore need a net gain of 24 seats to win a majority.
Besides stymieing the Trump agenda, a Democratic victory in the House could allow Democrats to launch multiple committee investigations of the Trump administration and possibly even impeachment proceedings.
They also could force Trump to scale back his legislative ambitions, possibly dooming his promises to fund a border wall with Mexico, pass a second major tax-cut package or carry out his hardline policies on trade.
So the Republicans could potentially increase their majority in the Senate.
"The contrast in this election could not be more clear", Trump told supporters in IN at a rally for Republican Mike Braun, who is facing incumbent Democratic Senator Joe Donnelly in a tight race. Moscow denies meddling and Trump denies any collusion.
Galdieri said that Trump's campaign took off back in 2015 "because of the hard line he took on immigration - that led him to the GOP nomination and to a win in the electoral college". In recent weeks, he's put the spotlight on a caravan of Central American migrants fleeing poverty and violence that he calls "an invasion" of criminals and terrorists.
After dozens of rallies and months on the campaign trail, President Trump has made a final closing argument to voters across the country: If you want America to prosper, vote for Republicans.
In the Senate, where terms are six years compared to just two in the House, fewer seats are up for grabs, and those that are make a flip there less likely.
The loss of power will test Trump's political hold on House Republicans, most of whom had pledged their support for him lest they face the wrath of the party's core supporters, who remain in his corner.
After a divisive campaign marked by fierce clashes over race, immigration and other cultural issues, Americans began casting votes early today to determine the balance of power in the US Congress and shape the future of US Donald Trump's presidency.
"I feel confident that we will win", said Nancy Pelosi, the Democratic House minority leader.
U.S. voters give verdict on Trump as control of Congress at stake
Eastern, NBC News projected that Jennifer Wexton had defeated Barbara Comstock in her bid to represent Virginia's 10th district. You're still up either because Senate returns are really slow, or you are obsessing over Alaska's toss-up gubernatorial race.
Preliminary voting patterns show another potential kick to Democrats in their quest of a "blue wave".
Some of the biggest Democratic stars of the campaign season were struggling.
Republicans are favoured to retain their slight majority in the U.S. Senate, now at two seats, which would let them retain the power to approve U.S. Supreme Court and other judicial nominations on straight party-line votes.
Among the historic wins for the Democrats were Rashida Tlaib (D-MI) and Ilhan Omar (D-MN), who both became the first Muslim women elected to Congress, Deb Haaland (D-NM), the first Native American woman elected to Congress, Jared Polis, the first openly gay governor in U.S. history, and Alexandra Ocasio-Cortez (D-NY), the youngest congresswoman ever at 29. Some 35 Senate seats were in play, as were nearly 40 governorships and the balance of power in virtually every state legislature.
Problems with voting machines prevented Americans from casting ballots in a dozen states, USA rights advocates said, following complaints about registration problems, faulty equipment and intimidation they have received throughout early balloting.
"I don't know what to say about women who are sympathetic to Kavanaugh".
Voter turnout, normally lower when the presidency is not at stake, could be the highest for a midterm election in 50 years, experts predicted. By any reckoning, this is a pivotal election for Americans, for American democracy, and for the rest of the world.
For example, Ezra Klein, "the former wunderkind at the Washington Post, now a [t] Axios or somewhere, actually said - and I've never seen this". If the Democrats control the House, they will be able to hinder Trump's ability to implement programs as he wishes.
Races to watch include Democrat Beto O'Rourke's challenge to Senator Ted Cruz in traditionally deep-Republican Texas. His searing nationalist rhetoric and tearing of cultural fault lines drew criticism that he had crossed a unsafe line after a gunman killed 11 people in a synagogue massacre in Pittsburgh and a Trump supporter mailed bombs to the President's top targets in politics and the media, including two former Presidents.
"I don't think he has been given enough credit for all of the good things that he has done; he has done a lot of good things.
I think it's about the character of the country", he said in Wilmington, Delaware, where he voted.