Chuck Rosenberg, a former FBI chief of staff under former Director James ComeyJames Brien ComeyTucker Carlson attacks press as ‘state media’ after Trump strips ex-CIA chief’s clearance Comey: Trump revoking Brennan's security clearance shows 'he will punish people who disagree with him' Trump draws bipartisan fire over Brennan MORE, on Monday said collusion is “absolutely a crime,” a day after President TrumpDonald John TrumpGillibrand urges opposition to Kavanaugh: Fight for abortion rights 'is now or never' Trump claims tariffs on foreign nations will rescue US steel industry: report Bannon announces pro-Trump movie, operation team ahead of midterms: report MORE’s lawyer Rudy Giuliani said it was not a crime.

“Collusion is a crime,” Rosenberg said on MSNBC's "MTP Daily." “We just happen to call it something else, we call it conspiracy, but it is absolutely a crime.”

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“You probably won’t find the crime bank heist in the criminal code but bank robbery is a crime too, and so I am sort of perplexed that it has come down to synonyms,” said Rosenberg, who once headed the Drug Enforcement Administration.

“If these folks don’t know that collusion and conspiracy are synonyms for one another and this is a legal strategy, then they might want to consider changing horses in this race,” Rosenberg added.

In several interviews on Monday, Giuliani asserted that collusion is not a crime.

“I have been sitting here looking in the federal code trying to find collusion as a crime,” Giuliani said on “Fox & Friends.” “Collusion is not a crime.” 

In a later interview on CNN, Giuliani again said that collusion was not a crime.

“I don't even know if that's a crime, colluding about Russians,” Giuliani told CNN. “You start analyzing the crime — the hacking is the crime. The president didn't hack. He didn’t pay them for hacking.”

Trump himself on Tuesday tweeted that collusion was not a crime, adding that it didn't matter any way because there was no collusion between his campaign and Russia, which intelligence agencies have concluded meddled in the 2016 election.

"Collusion is not a crime, but that doesn’t matter because there was No Collusion (except by Crooked Hillary and the Democrats)!" Trump wrote on Twitter.