"We have a lot of ads", he told reporters in the shadow of Air Force One's wing.
With terms of six years, about a third of the Senate is up for election every two years. Bob Corker (R-TN), who opted to not seek reelection.
"These midterms are incredibly significant because Donald Trump is the most polarising president in the USA and these midterms will decide whether or not there is a check to the Trump presidency, or whether Trump will proclaim himself vindicated and proceed unchecked for two years", says Professor Allan Lichtman from the American University in Washington DC.
"They want to impose socialism on our country. And they want to erase America's borders", Trump told a raucous rally in Chattanooga, Tennessee late on Sunday.
Fierce political battles were raging in races across the nation.
Democratic Gov. Tom Wolf is running for a second term against Republican Scott Wagner, a state senator from York County who has made millions in the waste-hauling industry. Democrats are relying more upon women, people of colour, young people and college graduates.
During a barnstorm flurry of rallies in Ohio, Missouri and in, he continued to whip up anti-immigration sentiment among his supporters, warning that Democrats would usher in an era of open borders and widespread crime.
"For Democrats, winning the House is not necessarily about advancing a major agenda of their own; it's about preventing the Republicans from advancing their agenda", Mr Kondik said.
Oprah Winfrey travelled to Georgia to campaign with Stacey Abrams ahead of the midterm election.
Midterm elections are often seen as a referendum on the president and there is no shortage of opinions this time around about the incumbent. "Nobody in my administration got indicted".
"We'll see tomorrow" what happens, Trump said on the tarmac in Fort Wayne.
How many undecideds or "soft Republican" voters will decide to switch last minute to cast a protest vote against Trump because of stuff like this? The answer is that the Democrats are having to defend 26 of their seats - 10 in states won by Trump in 2016 - while the Republicans have only nine seats in play, making it the most skewed contest since 1938. "There is a lot of energy out there".
Firstly, it would mean the party could block legislation proposed by the president. But a healthy economy favors the incumbent - and the U.S. economy has been growing with rare vigor.
It is a cunning play that would leave the estimated 60 House Republicans facing tough election fights anxious.
Democrats feel they need to limit the losses in the Senate. Eighteen percent of those polled were still undecided.
Another wild card: The campaign's closing days come just a week after a gunman, who allegedly hated immigrants and Jews, killed 11 people at a Pittsburgh synagogue.
Even as networks refuse to run the ad, Trump still espouses the same message in it, often telling crowds at his rallies that the migrant caravan is full of risky people. He hammered Trump and Republicans for repeatedly trying to repeal his signature health-care law while at the same time claiming to support the law's protections for those with pre-existing conditions.
He had allegedly lashed out online against Jews he accused of transporting Central American "invaders" into the United States, in language that echoed Trump's attacks on impoverished migrants coming through Mexico. And 76 percent of people earning less than $30,000 say they aren't better off.
Pollsters say Democrats may win the 23 seats they need to take over the House of Representatives, and possibly 15 or so extra seats. "This compares to the mid- to high 20s for most weeks during President Obama's previous year in office". 'We'll just have to work a little bit differently, ' he said.
Hurl pointed out the divisions that often occur in both parties, which can muddy the significance between a narrow Democratic majority and a narrow Republican majority.