Rick Perry compares Trump to cancer
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Former Texas Gov. Rick Perry is keeping up a public feud with GOP presidential rival Donald TrumpDonald John TrumpFeinstein, Iranian foreign minister had dinner amid tensions: report The Hill's Morning Report - Trump says no legislation until Dems end probes Harris readies a Phase 2 as she seeks to rejuvenate campaign MORE, saying Monday that the businessman is becoming a "cancer" to conservatism. 

"Defending conservatism against the cancer of Trump-ism – I hope you’ll join me Wednesday in DC," Perry tweeted Monday, linking to a policy forum in Washington where he will speak later this week.

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Perry said last week that "Trump-ism" involves "a toxic mix of demagoguery and nonsense," after which Trump said Perry "should be forced to take an IQ test" before the first GOP debate.

The pair have sparred for weeks after Perry become one of the first GOP presidential candidates on July 2 to denounce Trump's controversial remarks on immigrants from Mexico.

That led to a series of back-and-forth criticism between the two. Amid the feuding, Trump has skyrocketed in presidential polls, while Perry has fought to solidify a position in next month’s GOP debate.

Their clash saw an added element over the weekend, when Perry said that Trump disqualified himself for president when he suggested Sen. John McCainJohn Sidney McCainMeghan McCain says Ben Carson should be developing brain cancer treatment, not working at HUD Graham urges Trump not to abandon infrastructure talks with Democrats Pelosi receives John F. Kennedy Profile in Courage Award MORE (R-Ariz.), a former prisoner of war during Vietnam, was not a hero and that he preferred those who did not get captured.

Trump's criticism of McCain drew rapid backlash from other Republicans over the weekend.

Perry, who served in the Air Force, added Sunday on NBC's "Meet the Press" that Trump's comment was "a bullet that went through John McCain and hit a lot of us that were in the uniform in this country."

The former Texas governor continued to pan Trump's "absurdity" on Monday in an op-ed for National Review, writing that the position of president "is serious business, not a reality TV show."