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John Brennan, the CIA director under President Barack Obama, blasted President Donald Trump over his apparent coziness with Russian leader Vladimir Putin.

Brennan ripped Trump as "mean-spirited and dishonest" and said he has "shown a lack of integrity [that] demean[s] the office of the presidency."

Brennan, who served as National Counterterrorism Center chief under President George W. Bush, defended his fiery tweets criticizing Trump by telling MSNBC that the president appears to put his own interests ahead of the country's.

He said Trump's congratulatory call to Putin shows that he treats the controversial Russian ruler "so nicely while he treats Americans with such disdain."

"I worked for six presidents. All of them were trying to do what's best for [the United States]," Brennan said.

Host Mika Brzezinski, whose father Zbigniew worked in a key foreign policy role for President Carter, said Trump "has such terrible character."

Brennan said Trump's apparent "fawning attitude toward Mr. Putin" shows that "he does have something to fear."

The Jersey City, N.J. native said the Russians may have personally damaging information on Trump that the president is trying to stifle by appeasing the former KGB agent.

MSNBC contributor Mike Barnicle told Brennan he is worried that Trump is failing to follow suggestions from his national security staff.

Brennan said that Trump's actions on the foreign policy front may indeed worry allied countries like England and Germany, as to whether the United States will stand up for them.

On "America's Newsroom" Wednesday, Sen. Rand Paul (R-Ky.) ripped Brennan as a "partisan" who is "not in the tradition of law enforcement [officials who try] to be even-keeled."

“This is exactly why we need more control over the intelligence community," Paul said of Brennan, calling the former director an reliably "angry" critic of Trump

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