Ex-Romney aide: Trump pushed birtherism to win "rightwing crazies"
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A former aide to 2012 GOP nominee Mitt Romney said Republican presidential front-runner Donald TrumpDonald John TrumpOver 100 lawmakers consistently voted against chemical safeguards: study CNN's Anderson Cooper unloads on Trump Jr. for spreading 'idiotic' conspiracy theories about him Cohn: Jamie Dimon would be 'phenomenal' president MORE had previously pushed the birther argument to appeal to "rightwing crazies."

"I recorded a lot @realDonaldTrump better hope I didn't record him telling us to use birther argument bc 'rightwing crazies will believe it,'" Garrett Jackson tweeted on Thursday.

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Trump and Romney attacked each other on Thursday; Romney called Trump a "phony" and said he could not win in a general election against Democratic presidential front-runner Hillary ClintonHillary Diane Rodham ClintonTrump to declassify controversial text messages, documents related to Russia probe Hypocrisy in Kavanaugh case enough to set off alarms in DC Clinton: Hard to ignore 'racial subtext of virtually everything Trump says' MORE. He also questioned Trump's business successes.

Trump shot back at Romney during a rally Thursday, calling Romney a failed candidate saying he lost an election he should have won. Trump, who endorsed Romney in 2012, also said Romney had begged him for the endorsement.

"He was begging for my endorsement. I could have said, 'Mitt, drop to your knees.' He would've dropped to his knees."
Jackson tweeted on Thursday denying that Romney ever "begged" for the endorsement.
 
"I was with Mitt every time he saw @realDonaldTrump and guarantee Mitt never begged Trump. Wish I would've recorded Trump kissing Mitt's ass," Jackson tweeted.