DeMint has made headlines in several GOP primaries this cycle. He was an early supporter of Florida Senate candidate Marco RubioMarco RubioOvernight Defense: Commander calls North Korea crisis 'worst' he's seen | Trump signs VA order | Dems push Trump to fill national security posts What’s with Trump’s spelling mistakes? Boeing must be stopped from doing business with Iran 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 KirkThe way forward on the Iran nuclear deal under President Trump ObamaCare repeal bill would defund Planned Parenthood Leaked ObamaCare bill would defund Planned Parenthood MORE.

DeMint's support has become a counter-weight to Sen. John McCainJohn McCainMeghan McCain: Obama 'a dirty capitalist like the rest of us' Top commander: Don't bet on China reining in North Korea Trudeau, Trump speak for second night about US-Canada trade 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.