Elections for all the members of the House are held every two years.
Despite not being on the ballot, Trump made the midterm elections about him.
Citizens began casting their votes early on Tuesday morning (around 9:00pm AEDT), following a divisive campaign marked by fierce clashes over race, immigration and other cultural issues.
Limbaugh said he was assuming the massive early voting turnout would indicate huge crowds of voters on Tuesday.
The party in the White House often loses seats after a president's first two years in office, even if the president isn't a controversial figure like Trump. The Republicans are expected to increase their tally in the 100-Senate seat where they already have a very thin majority. Ironically, President Trump's campaign ended in a rally where his supporters broke into the gospel hymn Amazing Grace when someone in the audience had a medical emergency. Ballot counting could drag in tight races, leaving some races undecided long after Election Day. "Now it's like the hottest thing". But Trump and his associates appeared confident that the broad support they have in middle America would sustain. A driving force, on both sides, is rage: rage toward the president; rage the president has tried to foment against migrants, the news media and Democrats, among others.
Voting in Miami, Eloisa Alvarez said this election was "super important". Maybe back in '16 during the presidential, right around the vote. In 2017, when the administration was working towards traditional Republican economic priorities such as cutting taxes and limiting entitlements, Trump had a job approval rating of less than 70% job approval among Obama-Trump voters.
"I am extremely happy with the economy", Gerlock said.
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Republicans have played up the robust economy, but also used scare tactics and accused the Democratic Party of wanting to turn America into a socialist disaster rife with criminal illegal immigrants.
Since Donald Trump entered politics the Democrats have struggled to compete.
"This is our source of strength", O'Rourke said as he cast his ballot in El Paso.
Yet with several races very close, there is potential for a nail-biting denouement. None of it is going to happen unless they retake the White House and they know it.
Other tight Senate races are in Arizona, Florida, Indiana, Missouri, Montana, Nevada, North Dakota, Tennessee and West Virginia. The message to many is simple: Vote like the election is up to you, because it is.
The incumbent Democratic Senator Claire McCaskill is seen as vulnerable and may lose her seat to her Republican challenger Josh Hawley. "Today, we say enough". So another reason we need not be concerned about surprises in today's vote is that it was the idiosyncrasies of the U.S. presidential election system that turned a marginal error into a surprise president in 2016, and this system does not apply to the midterms. "We'll vote for fantastic candidates all over the country - including a historic number of women - who want to raise wages, fight for justice, and help more people get health care".
A crowd of people wait in line at a polling center in Utah.
NBC says it will stop airing Trump immigrant ad
Facebook , too, announced Monday that the ad could not be a paid ad on the site, though users can still post it themselves. Fox News , NBC and Facebook have pulled a Donald Trump campaign advert that has been widely condemned as racist.
Republicans have controlled the House since the conservative Tea Party movement propelled the GOP to a wave election in November 2010.
The first polls opened at 5am (10am GMT) local time in Vermont.
But as he visited IN on Monday he conceded the House may slip from his party's grasp.
"We'll just have to work a little bit differently", he told reporters.
Trump encouraged voters to view the first nationwide election of his presidency as a referendum on his leadership, pointing proudly to the surging economy at recent rallies.
The president has vowed to continue pushing for significant funding for a border wall, which Republicans may feel more comfortable with backing if voters hand them power again.
Just after, a gunman walked into a Pittsburgh synagogue and shot 11 worshippers dead.
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