WASHINGTON (AP) – Republican Sen. Pat Toomey of Pennsylvania is hedging his bets on backing his party’s nominee for president now that it’s apparent it’ll be Donald Trump.

Toomey wrote in a Sunday op-ed in The Philadelphia Inquirer that he’s “inclined to support the nominee” of his party but said that his differences with Trump could become “so great as to be irreconcilable.”

Toomey was narrowly elected in the GOP’s 2010 midterm landslide but is now running in a presidential election year in a state that Democrats have carried since 1992. Electoral pundits say his race is a toss-up.

Earlier, Toomey had said he would support the GOP standard-bearer, but that was before Trump became the presumptive nominee.