Sen. Marco RubioMarco RubioThe Memo: Trump seeks to put his stamp on nation Rubio: 'I hope' Mexican elections won't end partnership against cartels Election hacking fears turn heat on Homeland Security MORE (R-Fla.) is hosting a fundraiser for Rep. Tom CottonTom CottonHouse bill threatens Russia with nuclear treaty suspension Cotton: US policy should be regime change in Iran Only Congress can enable drone technology to reach its full potential MORE's (R-Ark.) Senate campaign in Miami, the latest help Rubio has provided to Cotton's campaign.

The senator will host a breakfast for Cotton at a popular Cuban restaurant in Miami on Monday, with the minimum contribution suggested at $500.

Rubio's leadership PAC is already spending heavily to help Cotton in his race against Sen. Mark Pryor (D-Ark.), airing ads touting Cotton's military background. The ads are the first major effort to help a 2014 candidate from the group.

The Miami Herald first reported the fundraiser.