Mitt Romney is blasting out robo-calls on behalf of Marco Rubio and John Kasich — and against Donald Trump — in the states voting Tuesday, marking his most direct appeal yet on behalf of any candidate since he delivered a scorching condemnation of Trump’s candidacy last week.

Voters are going to the polls Tuesday in Republican contests in Michigan, Mississippi, Idaho and Hawaii.

Romney’s team still insists the party’s 2012 presidential nominee is not endorsing any candidate, describing the latest robo-calls as more a bid to combat Trump than an indicator of support for Rubio or Kasich. Romney reportedly did pro-Rubio calls in all four states holding contests Tuesday, and recorded a pro-Kasich call in Michigan only.

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