OPINION

TRENDING: Gingrich: Romney can't 'close the deal'

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Presidential contender Newt Gingrich took harsh aim at rival Mitt Romney Monday, suggesting the former Massachusetts governor couldn't rally Republican support because he was being dishonest with voters.

"He can't close the deal. And he can't close the deal in part because people inherently don't trust what he's saying and think that he isn't always very candid with them. And sometimes frankly isn't straight," Gingrich said on CNN's "Starting Point with Soledad O'Brien."

The former House speaker said House Majority Leader Eric Cantor, who endorsed Romney Sunday, was another Washington insider falling in line for the GOP establishment pick.

"We would all like to have endorsements. But the fact is Romney is the Washington establishment candidate," Gingrich said. "It's true. If you look at where his money comes from, where most of the lobbyists lined up. So I think he goes around the country and he's legitimately collected most of the insiders. I like Eric Cantor, but he is sort of quintessentially part of the same group."