WASHINGTON — Already on a jam-packed travel schedule, President Trump will step up his campaigning as much as “he’s humanly able to do” in the final stretch before the midterm elections to bolster GOP candidates in tight races, according to the White House.

On Thursday, Trump kicked off a campaign swing of five rallies within seven days stretching from Montana to Wisconsin.

With Election Day looming Nov. 6, aides say Trump will increase the frequency of his raucous rallies.

“You are going to see a natural ramp-up as Election Day gets closer,” White House political director Bill Stepien told The Post. “He understands his value rallying support for his party’s candidates. So you are going to see him do as much as he’s humanly able to do.”

While he’s not on the ballot, Trump’s strategy is to convince supporters that their midterm vote in 2018 is just as important as their 2016 vote to send him to the White House.

The White House says Trump’s campaign efforts will outpace President Barack Obama and President George W. Bush’s travel. And so far, aides say GOP candidates get an average 13-point campaign bump after they get the Trump treatment.

“Since January of 2017 when the president was inaugurated, Republican voters have been content. They’ve been happy,” Stepien said. “Unemployment is down. They are employed. They are being paid well. The stock market is up. A content voter is not a voter who is energized to turn out.”

He added: “What’s changed just over the last few weeks is Republican voters are still happy with the direction of the country, but now those same voters are angry because of how Democrats attacked Brett Kavanaugh. Now they are scared because Democrats are about Medicare-for-All and socialized medicine. Now Republican voters are more plugged into what’s at stake.”

Trump has largely focused on states he won in 2016, including Arizona, Montana, North Dakota, Pennsylvania, Tennessee, Texas, West Virginia and Wisconsin.

He’ll campaign Saturday in Nevada, which Hillary Clinton carried, to give GOP Sen. Dean Heller a boost in his tight re-election campaign. The timing is meant to coincide with the start of early voting to have maximum impact.

“The president wants to make sure he’s spending time in places where he can affect the most votes at the right times,” Stepien said.