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Mitt Romney records anti-Trump robocall for Marco Rubio
Romney's warning is coming to a phone near you in four states voting Tuesday: Michigan, Idaho, Hawaii and Mississippi.
Mitt Romney, the former Republican presidential nominee, talks with people after speaking during the Republican National Committee's winter meeting aboard the USS Midway Museum on Jan. 16, 2015, in San Diego.
By Peter Alexander and Tim Stelloh
In his new role as Donald Trump's chief adversary, former Republican presidential nominee Mitt Romney has turned his alarm-fueled message into a robocall on behalf of struggling GOP contender Sen. Marco Rubio, NBC News has confirmed.