"Dealing a major setback to President Trump's legislative agenda".
The tax law was particularly problematic for Republicans in New Jersey, where at least three GOP-held seats flipped.
With a House majority, Democrats will have the power to investigate Mr Trump's tax returns, possible business conflicts of interest and allegations involving his 2016 campaign's links to Russian Federation.
The early wins give Democrats a share of the seats they'll need for House control.
Tuesday night's results are a much-needed win for the Democrats, who have struggled in recent midterm elections.
IN voters have a positive view of the nation's economic outlook - seven in 10 said the nation's economy is good while about 3 in 10 said it isn't. With media outlets projecting the Dems are going to retake the House of Representatives, the party is apparently not waiting for the gavel to start making moves against the president.
Trump, who campaigned aggressively in the last several weeks, expressed satisfaction over the results and described this as tremendous success.
But when it came to candidates for state Senate, Democratic primary voters threw their weight behind progressive candidates, including 27-year-old democratic socialist Julia Salazar - who actively campaigned on issues like sex workers' rights and racial injustice - and Alessandra Biaggi, another millennial and first-time candidate.
Cook said Democrats have a possibility of gaining as few as 20 seats and as many as 45 seats.
Political observers had a close eye on Georgia, where Democratic nominee Stacey Abrams was running to become the country's first black female governor, and Republican Karen Handel's race was expected to serve as a bellwether for the direction of the House.
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.
In Missouri, Republican Josh Hawley also unseated incumbent Democrat Sen. Republican candidates in some of the country's most competitive races gambled by tying themselves to Trump in a bid to turn out voters. "They can now open investigations into the president, and we'll finally find out if Donald Trump has ever done anything unethical".
Still, Trump will also have to answer for a scorched earth campaign on immigration in the final days that might have helped tip the House to Democrats, even if he can argue that his magnetism among his followers' candidates, such as Rep. Ron DeSantis, who won the Florida gubernatorial race, according to a CNN projection, Marsha Blackburn who will capture the Tennessee Senate race and Mike Braun, who defeated the incumbent Democratic Sen. In District 16, Democrat Tammy Story has a 13 percent lead over incumbent Republican Tim Neville, with 55 percent of the vote as of 10:36 p.m. on Election Night.
Several television networks, including the president's favorite Fox News Channel, yanked a Trump campaign advertisement off the air on the eve of the election, determining that its portrayal of a murderous immigrant went too far.
Democrats last had a majority in the House in 2010. It has lost ground among women, suburban voters, voters with college degrees, while showing little ability to win over young and minority voters.
Democrats faced a far more hard challenge in the Senate, where they were nearly exclusively on defense in rural states where Trump remains popular.
- Queen invites Meghan Markle's mum to royal family's Christmas celebrations
- Ariana Grande Thank U Next Song About Exes Pete Davidson | Personal Space
- White House shares doctored video to support punishment of journalist Jim Acosta
- Chris Christie floated as Sessions replacement after Trump installs 'acting' loyalist
- Shark victim one of 10 on private charter
- Tesla says Robyn Denholm of Telstra to be new board chair
- A 'Breaking Bad' Movie Is Reportedly About To Shoot In New Mexico
- U.S. election: Dead brothel owner wins landslide in Nevada
- California bar gunman who killed 12 people identified as former US Marine
- Android developers have two new ways to update their apps