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 TrumpHannity urges Trump not to fire 'anybody' after Rosenstein report Ben Carson appears to tie allegation against Kavanaugh to socialist plot Five takeaways from Cruz, O'Rourke's fiery first debate 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 AyotteGOP mulls having outside counsel question Kavanaugh, Ford Pallbearers, speakers announced for McCain's DC memorial service and Capitol ceremony Tributes pour in for John McCain MORE (N.H.) Ron JohnsonRonald (Ron) Harold JohnsonKavanaugh, accuser to testify publicly on Monday Kavanaugh furor intensifies as calls for new testimony grow House panel advances DHS cyber vulnerabilities bills MORE (Wis.), Mark KirkMark Steven KirkThis week: Trump heads to Capitol Hill Trump attending Senate GOP lunch Tuesday High stakes as Trump heads to Hill MORE (Ill.) and Rob PortmanRobert (Rob) Jones PortmanGraham calls handling of Kavanaugh allegations 'a drive-by shooting' Overnight Health Care: Senators target surprise medical bills | Group looks to allow Medicaid funds for substance abuse programs | FDA launches anti-vaping campaign for teens Bipartisan group wants to lift Medicaid restriction on substance abuse treatment 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 CruzFive takeaways from Cruz, O'Rourke's fiery first debate NY Times, McCabe give Trump perfect cover to fire Rosenstein, Sessions Live coverage: Cruz, O'Rourke clash in Texas debate 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.