GOP senator facing reelection won't commit to Trump
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Sen. Pat Toomey (R-Pa.) is raising concerns that he might not be able to support Donald TrumpDonald John TrumpTrump nominates ambassador to Turkey Trump heads to Mar-a-Lago after signing bill to avert shutdown CNN, MSNBC to air ad turned down by Fox over Nazi imagery MORE, the latest sign of a growing split over the GOP's presumptive presidential nominee. 

"I've got this set of doubts," Toomey told WAEB, a local radio station, on Monday. "And I hope we don't get to a point where I decide I just can't support him."

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Toomey added, "My message to Donald Trump is: You need to unite the Republican Party if you want to win this general election. I hope to get to the point where I can enthusiastically support Donald Trump. I'm not there right now."

Toomey is one of a handful of vulnerable GOP incumbents who are running for reelection in states previously carried by President Obama. GOP Sens. Kelly AyotteKelly Ann AyotteUS, allies must stand in united opposition to Iran’s bad behavior American military superiority will fade without bold national action Five possible successors to Mattis MORE (N.H.) Ron JohnsonRonald (Ron) Harold JohnsonGOP braces for Trump's emergency declaration GOP wants to pit Ocasio-Cortez against Democrats in the Senate USCIS child marriage report: Laws that do not value girls are baked into our system MORE (Wis.), Mark KirkMark Steven KirkThe global reality behind 'local' problems Dems vow swift action on gun reform next year This week: Trump heads to Capitol Hill MORE (Ill.) and Rob PortmanRobert (Rob) Jones PortmanSteel lobby's PR blitz can't paper over damaging effects of tariffs Trade official warns senators of obstacles to quick China deal Lawmakers divided over how to end shutdowns for good MORE (Ohio) have each said they will support the party's eventual nominee.

His comments come after Trump locked down his status as the party's presumptive nominee last week when rivals Sen. Ted CruzRafael (Ted) Edward CruzPoll shows competitive matchup if O’Rourke ran for Senate again Democrats veer left as Trump cements hold on Republicans O’Rourke heading to Wisconsin amid 2020 speculation MORE (Texas) and Ohio Gov. John Kasich dropped out of the race following Trump's victory in the Indiana primary.

Though Toomey previously suggested he would support Trump if he were the nominee, he's also tried to publicly create space between the two campaigns.

"Trump was not my first, second, or third choice. I object to much in his manner and his policies," he wrote Sunday in a Philadelphia Inquirer op-ed.

Building a wall between the two races is likely an impossible task, with strategists predicting Trump will loom over the Pennsylvania Senate contest. Katie McGinty, Toomey's Democratic opponent, has repeatedly linked the two as she seeks to unseat the GOP senator.

Trump won the state's primary earlier this year but faces an uphill battle in November. A Republican presidential candidate hasn't carried Pennsylvania since 1988.