Delaware Sen. Christopher Coons Christopher (Chris) Andrew CoonsMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D) on Monday said President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE is "clearly going after the rule of law" by attacking the FBI and the Department of Justice over investigations into him.

“The president is clearly going after the rule of law and our criminal justice system. And he’s undermining it,” Coons said in an appearance on CNN's "New Day."

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Coons took particular exception to a Trump tweet on Sunday saying it was "unthinkable & unheard of" for the FBI to raid his former personal attorney Michael Cohen's office in April, when agents for the bureau seized documents from Cohen's office and home.

"Remember, Michael Cohen only became a 'Rat' after the FBI did something which was absolutely unthinkable & unheard of until the Witch Hunt was illegally started," Trump tweeted. "They BROKE INTO AN ATTORNEY’S OFFICE! Why didn’t they break into the DNC to get the Server, or Crooked’s office?"

Coons shot back at the assertion that the FBI "broke into an attorney's office."

"For the millions of people who follow closely what President Trump has to say on Twitter every day, the idea that the FBI broke into his attorney’s office runs right up against the foundation of our law," Coons added.

The FBI was executing a search warrant that had been approved following a referral from special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE, who is investigating Russian interference in the 2016 election and possible collusion between the Trump campaign and Russia.

Coons on Monday said that the FBI "was executing a duly authorized warrant."

"Law enforcement — federal, state, local law enforcement — doesn’t just break into people’s offices," he said. "They were executing a warrant issued with the approval of a judge. This is part of how investigations work."

Coons also criticized Trump's characterization of the raid, saying that Trump sounds "more like a mob boss" than the president.

“His use of the term ‘rat’ for Michael Cohen and mischaracterizing this as a break-in into his attorney’s office frankly makes him sound more like a mob boss than the president of the United States," Coons said.

Coons added that he thought Trump's attacks on the FBI are "not good" for law enforcement.

"This is not healthy for law enforcement," Coons said. "Law enforcement doesn’t want to be dragged into partisan politics. They’re just going to keep doing their job.”