Romney not ruling out voting for Libertarian candidate
In an interview with CNN's Wolf Blitzer, Mitt Romney says he may be open to supporting third party candidate New Mexico Gov. Gary Johnson.
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Mitt Romney speaks out against Donald Trump 14 videos
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Romney not ruling out voting for Libertarian candidate
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Former US Republican presidential candidate Mitt Romney speaks at the Conservative Political Action Conference (CPAC) in National Harbor, Maryland, on March 15, 2013.
Mitt Romney: 'This is breaking my heart'
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Romney warns Trump could inspire 'trickle-down racism'
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Romney warns of demagogues to new grads
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Former Republican presidential candidate and former Massachusetts Governor Mitt Romney delivers remarks during the second day of the 40th annual Conservative Political Action Conference (CPAC) March 15, 2013 in National Harbor, Maryland.
Mitt Romney will not attend GOP convention
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The Donald Trump vs. Mitt Romney fight — In one minute
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Trump on Romney: 'Are you sure he's a Mormon?'
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Former Republican presidential candidate and former Massachusetts Governor Mitt Romney delivers remarks during the second day of the 40th annual Conservative Political Action Conference (CPAC) March 15, 2013 in National Harbor, Maryland.
Mitt Romney: Contested convention 'realistic' scenario
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Trump: Romney was 'begging' for my endorsement
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DALLAS, TX - SEPTEMBER 14:  Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event.  (Photo by Tom Pennington/Getty Images)
Trump: Romney 'chickened out' because of me
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Romney: Trump's promises are worthless
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Mitt Romney on Trump: 'A business genius he is not'
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Romney: Dishonesty is Trump's hallmark
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LOUISVILLE, KY - MARCH, 1:   Republican presidential candidate Donald Trump waves to the crowd after a rally March 1, 2016 in Louisville, Kentucky. Trump is campaigning nationwide on Super Tuesday, the single largest primary voting day. (Photo by Aaron P. Bernstein/Getty Images)
GOP officials' last-ditch effort to stall Trump
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