Gingrich: Cruz isolating himself with Trump snub
© Greg Nash

Former Speaker Newt Gingrich (R-Ga.) said Thursday that Sen. Ted CruzRafael (Ted) Edward CruzState Department's top arms control official leaving Sanders NASA plan is definitely Earth first Trump judicial picks face rare GOP opposition MORE (R-Texas) has alienated any potential allies in the GOP by refusing to endorse Donald TrumpDonald John TrumpJulián Castro: It's time for House Democrats to 'do something' about Trump Warren: Congress is 'complicit' with Trump 'by failing to act' Sanders to join teachers, auto workers striking in Midwest MORE for president.

“This is so silly,” he said Thursday on “The Mike Gallagher Show." "This is the kind of move that led to Ted Cruz being totally isolated."

“If he goes back to the Senate retaining that kind of attitude, he will be utterly ineffective and have virtually nobody who will work with him,” Gingrich added. “This is just childish stuff. At some point in the American model, you’re supposed to say to the guy who beat you, ‘Great job, let’s see what we can do moving forward.’ ”

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Gingrich said Cruz should not have attended the Republican National Convention if he planned on snubbing Trump.

“Conventions are held in order to nominate somebody to win the presidency,” he said. "They’re not held to be a psychodrama for somebody."

“To show up, it’s like going to your neighbor’s garden party so you can pour acid on the petunias,” added Gingrich, who was among the contenders for Trump's VP. "If this is what he was going to do, he shouldn’t have come."

Gingrich said Cruz’s decision helps boost Democrat Hillary ClintonHillary Diane Rodham ClintonMissing piece to the Ukraine puzzle: State Department's overture to Rudy Giuliani On The Money: Trump downplays urgency of China trade talks | Chinese negotiators cut US trip short in new setback | Trump sanctions Iran's national bank | Survey finds Pennsylvania, Wisconsin lost the most factory jobs in past year Meghan McCain, Ana Navarro get heated over whistleblower debate MORE’s chances of winning the White House.

“Cruz is in grave danger of becoming the guy who helped elect Hillary Clinton,” he said.

Cruz on late Wednesday declined to endorse Trump during his speech at the convention.

“Stand and speak and vote your conscience, vote for candidates up and down the ticket who you trust to defend our freedom and to be faithful to the Constitution,” he said in Cleveland.

Listeners jeered Cruz for refusing to back Trump, his former Republican presidential primary opponent.

Cruz on Thursday said he could not fully back Trump after their at-times bitter rivalry.