Donald Trump went on an eve-of-poll campaign blitz on Monday, holding three rallies targeting vulnerable Democrats amid hope that Republicans can retain their majority in the US Senate.
With America returning to the ballot box on Tuesday for the first time since the 2016 election, the US president scheduled campaign stops in Ohio, Indiana and Missouri in a last-minute push for votes.
All three feature Democrat senators fighting for re-election in states that Mr Trump won two years ago – meaning his late interventions could tilt things in his party’s favour.
A string of polls published ahead of Tuesday’s midterm elections told a similar story – Democrats look likely to win a majority in the House of Representatives while Republicans should retain their hold on the Senate.
However forecasters urged caution, noting that a string of razor-tight races, the possibility of a record turnout and polling limitations laid bare in 2016 all make predictions impossible.
Mr Trump has thrown himself into the campaign, holding more events than his predecessors Barack Obama and George W Bush did while in office and urging voters to imagine his name is on the ballot.
However the decision to make himself the face of his party’s national campaign comes with political risks, not least the difficulty in blaming others if results do not go his way.
Mr Trump struck an upbeat tone on Monday when speaking to reporters in the White House before departing for his last day of campaigning.
“There’s a great electricity in the air like we haven’t seen in my opinion since the 2016 election,” Mr Trump said.
“So something’s happening. We’ll see, but I think we’re going to do very well.”
The US president has turned up the dial on warnings about illegal immigration in recent weeks, believing that the issue motivates his base and will drive up turnout – likely to be a key factor in the results.
He has likened migrant caravans approaching through Central America to an “invasion”, deploying more than 5,000 US soldiers to the southern border and even suggesting he could temporarily shut the crossing entirely.
The tactic appears to have had an effect, with the number of Republicans saying immigration is “one of the most important issues" in their vote jumping from 14 per cent to 21 per cent in three weeks, according to a Post-ABC News poll.
However the strategy has caused some tensions with the party’s congressional leaders who planned to put a positive message about America’s booming economy and Mr Trump’s tax cuts front and centre. There are fears Mr Trump’s hardline rhetoric on immigration could put of swing voters.
It has emerged that Fox News and Facebook have joined CNN, NBC News and other platforms in refusing to show a Trump campaign advert featuring a migrant criminal boasting of cop killing that critics have called racist.
Barack Obama, the former president, has reemerged to lead the Democrat charge in the final few days of campaigning, breaking with his largely observed silence on Mr Trump with a series of emotive speeches.
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He has urged voters not to be “hoodwinked” and “bamboozled” by the Trump administration’s migrant caravan warnings, saying: “While they are trying to distract you with all this stuff, they are robbing you blind.”
Mr Obama has also lashed out at Republican claims they will protect the right for people with pre-existing medical conditions to get health insurance – a key part of his ‘Obamacare’ health legislation.
Democrats have zoned in on the issue in recent campaign adverts, seeing healthcare as a weakness for Mr Trump’s party and also one of the issues that voters most care about, according to polls.
As well as all House of Representative seats and a third of Senate seats up for grabs, a string of state-wide governorships and other offices are being contested. Voting will take place throughout Tuesday, with results to emerge overnight.