Trump said on Twitter Tuesday that "Attorney-client privilege is dead!" He added: "A TOTAL WITCH HUNT!!!"
Agents raided the office of Trump's personal attorney Michael Cohen on Monday, seizing records on topics including a $130,000 payment made to porn actress Stormy Daniels.
The raid was overseen by the U.S. Attorney's office in Manhattan and was based in part on a referral from special counsel Mueller, said Cohen's lawyer, Stephen Ryan.
Trump raged over the raid Monday, calling it a "disgrace." He also called Mueller's investigation "an attack on our country," prompting new speculation that he might seek the removal of the Justice Department's special counsel.