"If there's anyone that shouldn't be trusted with regard to intelligence, it's Donald Trump, both in the literal sense and with regard to our intelligence services," McMullin said on CNN's "The Lead" Wednesday.

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"He shouldn't have access to these briefings," continued McMullin, who served for 11 years at the CIA, noting the briefings involve highly sensitive material.

"Hopefully, we're not sharing everything we could be with him," he added.

McMullin said Trump wouldn't be able to get a security clearance if applying for a "low-level job at the CIA" because he has been "co-opted by Vladimir Putin." "He doesn't realize it, or maybe he does and he doesn't care, but he's manipulated by Vladimir Putin," McMullin said, adding Trump aides have "deep ties to the Kremlin." McMullin said those ties would be flagged by intelligence officials as a potential problem. Asked whether he was referring to ties on the part of Trump campaign chairman Paul Manafort or adviser retired Gen. Michael Flynn, McMullin said: "I'm talking about tall of them." "Donald Trump himself has financial ties to oligarchs in Russia," McMullin stated.

Trump indicated early Wednesday, hours before he was slated to receive his first classified intelligence briefing, that he didn't trust information coming from the U.S. intelligence community.

Trump told Fox News that he will not rely on some intelligence, stating, "I won't use them, because they’ve made such bad decisions."