Ohio Gov. John Kasich isn't ruling out voting for Republican presidential nominee Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE, though he says it's "highly unlikely" he'll support his former rival.

"I'll let everybody know when, but I think my actions have spoken very loudly, louder than even my words," Kasich told CNN's Dana Bash in an interview broadcast Friday on "New Day."

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The former Republican presidential candidate indicated he won't vote for Democrat Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE and hasn't considered voting for Libertarian Gary Johnson Gary Earl JohnsonWhat the numbers say about Trump's chances at reelection Presidential race tightens in Minnesota as Trump plows resources into state The Hill's Campaign Report: Biden condemns violence, blames Trump for fomenting it l Bitter Mass. primaries reach the end l Super PAC spending set to explode MORE.

"So is it still possible that you could vote for Donald Trump?" Bash pressed.

"Very unlikely," Kasich responded, adding, "Too much water under the bridge."

And if Trump wins?

"Well, we'll see what happens if that happens," Kasich said. "Whoever is the president, if I can do something to help them in a constructive way, and something I agree on, absolutely."

Kasich has been one of a few former Trump rivals to withhold their endorsement, despite an earlier pledge to back the eventual nominee. Sen. Ted Cruz Rafael (Ted) Edward CruzThe Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy Murkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight MORE (R-Texas) and former Florida Gov. Jeb Bush have both also refused to get behind New York real estate mogul.

On Thursday, news emerged that President Obama had enlisted the Ohio governor to make a final push for his stalled Trans-Pacific Partnership trade deal.

Kasich will attend a bipartisan meeting Friday at the White House aimed at touting the benefits of the Pacific Rim trade agreement before later appearing at the White House daily briefing.

"Frankly, I welcome it," Kasich said of backlash to his decision to join the effort, speaking of putting the country over the party.

And while he's not pushing Trump in Ohio, a swing state where polling this week has indicated a tight race, Kasich said he would try to get Republicans to the polls in general.

"We're going to go help people get the vote out, obviously," Kasich said. "Get Republicans out to vote, period."

"We want to reelect Sen. [Rob] Portman, and we want to reelect people down-ticket," he said.