Sen. Ed MarkeyEdward (Ed) John MarkeyOvernight Defense: Mattis dismisses talk he may be leaving | Polish president floats 'Fort Trump' | Dem bill would ban low-yield nukes Dems introduce bill to ban low-yield nukes Some employees' personal data revealed in State Department email breach: report MORE (D-Mass.) responded on Thursday to President Trump's announcement that he has no tapes of past meetings with former FBI Director James Comey, saying Trump "can't stop" demeaning the presidency.

"The president is like Geraldo Rivera saying he was going to open Al Capone's vault and, of course, there was nothing inside," Markey told MSNBC's Greta Van Susteren.

Van Susteren asked Markey if he thought Trump's earlier tweets threatening Comey about "tapes" amounted to intimidation of a witness. Markey responded that he believed it did.

"It does run to intimidation of a witness, which is why Robert Mueller must investigate the entirety of this tapes incident," Markey said, referring to the special counsel appointed to oversee the federal investigation into Russian interference in the presidential election.

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Markey was then pressed on what Trump's defense could possibly be for tweeting that Comey "better hope" Trump didn't have recordings of their conversations.

"I don't think there's any other explanation than he's a bully, and he doesn't want this Russia investigation to continue," Markey said. "He only is matched by Wile E. Coyote in terms of self-inflicted wounds, and he just keeps acting this way."

Markey says Trump has no respect for his office or the government.

"He doesn't respect the Congress. He doesn't respect the judiciary. He doesn't respect his own office," Markey said. "It's just disrespectful of the office."