Former CIA director and Defense Secretary Leon Panetta raised concerns Tuesday that President Trump’s allegation that former President Obama wiretapped Trump Tower prior to the presidential election “weakens” his office.

Trump tweeted the accusation Saturday, but both the president and his staff have refused to provide any evidence of the claim.

"I mean this is the president of the United States,” Panetta said in an interview with CNN’s Wolf Blitzer Tuesday evening. "And he has a responsibility to speak the truth to the American people. When he engages in these kinds of tweets and throws out these kinds of allegations, I think he weakens the office of the presidency.”

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Panetta, who on Sunday said the president’s unproven allegations “makes us vulnerable to our enemies,” said he is “very concerned” that the Trump administration is in a “bunker mentality.”

"I sense that the White House is in a bunker mentality in which they think everybody is against them and the president feeling that way is now tweeting out anything he wants to say,” Panetta continued.

He also suggested Trump was attempting to use his tweets and allegations to distract from the investigations into Russian interference in the 2016 presidential election, as well Trump associates’ reported communication with Russian officials prior to November.

Panetta led the CIA and Defense Department during the Obama administration. He also held multiple positions in the Clinton administration. His son, Jimmy Panetta, represents California's 20th District as a Democrat.