Several politicians thought to be in consideration as Mitt Romney’s running mate have joined the presumptive GOP presidential nominee at a Utah retreat.

More than 500 individuals are expected to attend the event with big Romney donors in Utah, according to a report in Bloomberg.

Former Gov. Tim Pawlenty (Minn.), Sen. Rob PortmanRob PortmanCongress should think twice on the Israel Anti-Boycott Act Senators push for possible FCC enforcement over Lifeline fraud The fight to protect the Affordable Care Act isn’t over MORE (Ohio), Rep. Paul RyanPaul RyanGOP chairman to discuss Charlottesville as domestic terrorism at hearing Trump’s isolation grows GOP lawmaker: Trump 'failing' in Charlottesville response MORE (Wisc.), Gov. Bobby Jindal (La.), Gov. Bob McDonnell (Va.), and Sen. John ThuneJohn ThuneWaymo taps Senate Commerce staffer for government affairs team Billboard ads target Republicans who want to roll back net neutrality GOP debates tax cuts vs. tax reform MORE (S.D.) will be among the attendees, according to ABC News.

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The 2008 GOP nominee Sen. John McCainJohn McCainBush biographer: Trump has moved the goalpost for civilized society White House to pressure McConnell on ObamaCare McCain: Trump needs to state difference between bigots and those fighting hate MORE (Ariz.), former Gov. Jeb Bush and former secretaries of state Condeleeza Rice and James Baker III are also joining the event, according to Bloomberg’s report.

Notably absent will be Sen. Marco RubioMarco RubioScarborough: Trump has chosen the 'wrong side' THE MEMO: Trump reignites race firestorm RNC spokeswoman: GOP stands behind Trump's message 'of love and inclusiveness' MORE (Fla.) who is thought to be among the top veep options for the GOP presidential hopeful, according to the Wall Street Journal. Rubio told the Journal he wanted to spend the time with his kids.

Attendees flew to Salt Lake City Thursday night and went to a cookout at Olympic Park Friday night, according to ABC News. Chateaux at Silver Lake, a hotel, is hosting the event, Bloomberg reported.

The event will be a who’s who of the GOP party and is sure to be an attractive event for donors. Fundraising events are key for donors to get their time to hob-nob with the leaders the are supporting.

This retreat is no different. Campaign and party heads such as former White House advisor and American Crossroad super-PAC founder Karl Rove will field private meetings with donors and offer lectures on several issues like foreign policy, Bloomberg reported.