Former CIA director: Trump has shown a lack of integrity

Former CIA Director John BrennanJohn Owen BrennanFederal prosecutor looking into Brennan's role in Russian interference findings: report FISA court's rebuke of the FBI: It broke or ignored the rules and our rights Where was American counterintelligence? MORE told MSNBC's "Morning Joe" on Wednesday that President TrumpDonald John TrumpMnuchin knocks Greta Thunberg's activism: Study economics and then 'come back' to us The Hill's Morning Report - House prosecutes Trump as 'lawless,' 'corrupt' What to watch for on Day 3 of Senate impeachment trial MORE has shown a "lack of integrity" in office.

In an interview, the former Obama-era CIA chief explained his tweets attacking Trump following the firing of Deputy FBI Director Andrew McCabeAndrew George McCabeMcCabe accuses Trump officials of withholding evidence in lawsuit over firing McCabe: Being accused of treason by Trump 'quite honestly terrifying' Horowitz report is damning for the FBI and unsettling for the rest of us MORE, whom Brennan defended.

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"The president has shown a lack of understanding of international affairs, as well as a real ignorance about what it takes to be president of the United States," Brennan said. 

"He is mean-spirited, he is dishonest, he has shown a lack of integrity, and he has continued to, I think, demean the office of the presidency," Brennan added.

Brennan's comments follow a tweet from the former CIA director accusing the president of turning McCabe into a "scapegoat" for problems at the FBI. McCabe said last week that he was fired over his proximity to former FBI Director James ComeyJames Brien ComeyNYT: Justice investigating alleged Comey leak of years-old classified info Bernie-Hillary echoes seen in Biden-Sanders primary fight Rosenstein on his time in Trump administration: 'We got all the big issues right' MORE, who was fired last year.

"When the full extent of your venality, moral turpitude, and political corruption becomes known, you will take your rightful place as a disgraced demagogue in the dustbin of history. You may scapegoat Andy McCabe, but you will not destroy America ... America will triumph over you," Brennan tweeted in response to Trump.

His comments referring to Trump's "lack of understanding of international affairs" appeared to be a reference to Trump's recent announcement of tariffs on steel and aluminum imports, which were widely panned by Washington Republicans and free trade advocates.

Brennan condemned the tariff plan in a tweet earlier in March.

"You show an amazing albeit unsurprising ignorance of how technology, automation, and the attendant evolution of economics and societies have transformed the world. Your simple minded policies--imposition of tariffs--have the potential to seriously damage our future prosperity," Brennan wrote.

Brennan is a frequent critic of the president, and in February tweeted that the president was being "petty" by attacking law enforcement over the ongoing Russia investigation.

"It never ceases to amaze me how successful you have been making yourself so small, petty, and banal with your tweets," Brennan said at the time. "Your insecurity is well deserved, as is your concern over Russia investigation. Thomas Paine was right when he said, 'These are the times that try men's souls.'"