DeMint has made headlines in several GOP primaries this cycle. He was an early supporter of Florida Senate candidate Marco RubioMarco Antonio RubioSenate moving ahead with border bill, despite Trump Hillicon Valley: New FTC chief eyes shake up of tech regulation | Lawmakers target Google, Huawei partnership | Microsoft employees voice anger over ICE contract Lawmakers urge Google to drop partnership with Chinese phone maker Huawei MORE (R) -- he introduced him at the recent CPAC conference in Washington -- and backed conservative state Assemblyman Chuck DeVore (R) in California. He also toyed with the idea of backing developer Patrick Hughes's primary challenge to now-Illinois GOP Senate nominee Mark KirkMark Steven KirkThis week: Trump heads to Capitol Hill Trump attending Senate GOP lunch Tuesday High stakes as Trump heads to Hill MORE.

DeMint's support has become a counter-weight to Sen. John McCainJohn Sidney McCainTrump's America fights back Mellman: Trump can fix it GOP strategist Steve Schmidt denounces party, will vote for Democrats MORE (R-Ariz.), who is backing Republican Carly Fiorina in California and Norton in Colorado. McCain also backed Kirk in Illinois and he has supported Florida Gov. Charlie Crist (R) in the past.