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 PortmanRobert (Rob) Jones PortmanLongtime tax aide leaving Senate Finance Committee Ex-McConnell policy aide joining lobby firm WATCH: Sen. Flake: “More doubtful” North Korean summit will happen  MORE (Ohio), Rep. Paul RyanPaul Davis RyanDon't let them fool you — Republicans love regulation, too Senate harassment bill runs into opposition from House The Hill's Morning Report — Sponsored by PhRMA — The art of walking away from the deal MORE (Wisc.), Gov. Bobby Jindal (La.), Gov. Bob McDonnell (Va.), and Sen. John ThuneJohn Randolph ThunePoll: 8 in 10 people in key states concerned about driverless cars Hillicon Valley: Mnuchin urges antitrust review of tech | Progressives want to break up Facebook | Classified election security briefing set for Tuesday | Tech CEOs face pressure to appear before Congress Senate GOP urges Trump administration to work closely with Congress on NAFTA MORE (S.D.) will be among the attendees, according to ABC News.

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The 2008 GOP nominee Sen. John McCainJohn Sidney McCainTo woo black voters in Georgia, Dems need to change their course of action Senate panel again looks to force Trump’s hand on cyber warfare strategy Senate panel advances 6B defense policy bill 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 Antonio RubioTrump appears to confirm deal on Chinese firm ZTE Hillicon Valley: Experts worry North Korea will retaliate with hacks over summit | FBI works to disrupt Russian botnet | Trump officials look to quell anger over ZTE | Obama makes case for tighter regs on tech Putting pressure on Trump, House passes bill barring government from doing business with ZTE 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.