Ohio Gov. John Kasich isn't ruling out voting for Republican presidential nominee Donald TrumpDonald John TrumpRosenstein expected to leave DOJ next month: reports Allies wary of Shanahan's assurances with looming presence of Trump States file lawsuit seeking to block Trump's national emergency declaration 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 ClintonHillary Diane Rodham ClintonRoger Stone shares, quickly deletes Instagram photo of federal judge on his case Barack, Michelle Obama expected to refrain from endorsing in 2020 Dem primary: report Why the national emergency? A second term may be Trump’s only shield from an indictment MORE and hasn't considered voting for Libertarian Gary JohnsonGary Earl JohnsonPotential GOP primary challenger: Trump's 'contempt for the American people' behind possible bid The Hill's 12:30 Report — Presented by Kidney Care Partners — Trump escalates border fight with emergency declaration Former Mass. governor takes step toward Trump primary challenge 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 CruzRafael (Ted) Edward CruzEl Chapo's lawyer fires back at Cruz: 'Ludicrous' to suggest drug lord will pay for wall Democrats have a chance of beating Trump with Julian Castro on the 2020 ticket Poll shows competitive matchup if O’Rourke ran for Senate again 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.