“This is a very dangerous day today for lawyer-client relations,” Harvard Law professor Alan Dershowitz told Fox News on Monday amid reports that the FBI had raided the office and home of President Trump’s personal attorney Michael Cohen.

In the simultaneous raids on Monday, the FBI confiscated information from Cohen’s office and home related to an investigation into “possible bank fraud, wire fraud, and campaign finance violations,” according to the The Washington Post’s sources. The campaign finance issue appears to be connected to Cohen’s payment of $130,000 to Stormy Daniels, the porn star who is in a legal battle with Cohen and Trump over a non-disclosure agreement she signed for the money in 2016.

Speaking to Fox shortly after news of the raids broke, the widely-respected legal scholar warned about the possible ramifications of the Special Counsel Robert Mueller-prompted seizure of Cohen’s legal documents, computers and emails, which Dershowitz suggested was a violation of the crucial principle of lawyer-client privilege.

“I tell [my clients] on my word of honor that what you tell me is sacrosanct,” he said, in a moment highlighted by the Washington Examiner. “And now they say, just based on probable cause … they can burst into the office, grab all the computers, and then give it to another FBI agent and say, ‘You’re the firewall. We want you now to read all these confidential communications, tell us which ones we can get and which ones we can’t get.'”