Former Republican presidential candidate John Kasich on Monday ruled out the possibility that he would run for the White House in a third party bid.

“I’m not gonna do that,” the Ohio governor told CNN in an exclusive interview, his first since leaving the race. “I gave it my best where I am. I just think running third party doesn’t feel right. I think it’s not constructive.”

Kasich acknowledged that he has had a phone call with “somebody” who wanted him to mount an independent bid.

“A third party candidacy would be viewed as kind of a silly thing,” he said. “And I don’t think it’s appropriate. I just don’t think it would be the right thing to do.”

Trump became the party’s presumptive nominee after he won the Indiana Republican primary on May 3, prompting both Kasich and fellow Republican primary contender Ted Cruz to drop out of the race.

But on Saturday, reports said that a group of Republicans, including 2012 presidential nominee Mitt Romney, is actively plotting to draft an independent presidential candidate who could keep Trump from the White House.

The group had reportedly reached out to both Kasich and freshman Sen. Ben Sasse (R-Neb.), a conservative who has become one of Trump’s sharpest critics, in an attempt to convince them to run independently.

The report is not the first time that Republicans were planning a move to counter Trump’s candidacy. In March, after Trump swept four five state primaries in one day, party bigwigs met to lay out a plan to derail the frontrunner’s path to the nomination. It is unknown what became of that effort.