WATCH: Colbert Rips Romney's Trump Roast: After All, It Came From Trump's Worst Failed Investment

The election is in full swing and upcoming primaries include Michigan, Maine, Ohio, Kentucky, Louisiana, Nebraska and Florida. Even after all those states vote, we're not even halfway through the primary process. Which makes it the perfect time to try to stop Donald Trump from snagging the nomination, right?

"They don't want to be with this guy, but the voters are choosing this," said "Late Show" host Stephen Colbert. "It's like an arranged marriage. And unlike some of Trump's other marriages, this one could last eight years!"

Republican Senate Majority Leader Mitch McConnell vowed that if Trump is the nominee, he and his colleagues will "drop him like a hot rock." 

"In a desperate attempt to stop Trump, they tried a new approach of a very old approach," Colbert explained. "Faced with a monster, the GOP had only one choice: Unleash the Romney."

Unlike Romney 2012, Romney 2016 had some harsh criticisms of Trump.

"Isn't he a huge business success? And doesn't he know what he's talking about? No, he isn't, and no, he doesn't," Romney told his Hinkley Institute audience in Salt Lake City yesterday.

Colbert agreed. "True, Trump has put his name on some terrible investments. For example, four years ago, he endorsed Mitt Romney for president!" So you can imagine why Trump supporters weren't buying it.

Watch: How not to convice Trump supporters to change their minds:

Bonus: Obama destroys Romney in 2012 debate: "Every time you've offered your opinion, you've been wrong." 

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