(CNN) – 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."
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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."
Romney's success thus far has been bolstered by his robust fundraising, Gingrich said, but he predicted an eventual drying up of campaign cash.
"I think the challenge is that Gov. Romney has had a huge amount of money, most from Wall Street and a great deal from companies that were bailed out by the taxpayer," Gingrich said. "But he has used that money very effectively first against me and then against Santorum. But he can't close the deal."
He continued, "It's not at all clear to me right now that Romney can get above a certain ceiling," he said. "And the question is whether or not ultimately his money starts to run out. It's very clear in any kind of relatively evenly-financed campaign Romney would not win."