Cohen is already a subject of scrutiny in Mueller's investigation, which is examining Russia's interference in the 2016 election and whether members of the Trump campaign colluded with Moscow to tilt the race in Trump's favor.
President Donald Trump slammed the FBI's raid on the offices of his longtime personal attorney, Michael Cohen, and called the incident "a disgraceful situation".
Trump also called the probe by Special Counsel Robert Mueller into 2016 election meddling "an attack on our country".
Federal Bureau of Investigation agents raided Cohen's Manhattan office, seizing records about Cohen's clients, including those related to a 2016 payment he made to porn star Stormy Daniels, who claims to have had a sexual encounter with Trump.
Hours after the raid, Trump raged: 'They raid an office of a personal attorney early in the morning and I think it's a disgrace'. "It's an attack on what we all stand for, so when I saw this and when I heard it, I heard it like you did, I said that is really now in a whole new level of unfairness". "Many people have said, 'you should fire him.' Again, they found nothing, and in finding nothing, that's a big statement".
To obtain a warrant, prosecutors and agents must convince a judge that they have probable cause of criminal activity and that they believe they'll find evidence of wrongdoing in a search.
Trump's comments came shortly after the Federal Bureau of Investigation reportedly raided the office and hotel room of his personal attorney, Michael Cohen, on Monday afternoon. Agents seized records related to the $130,000 Cohen paid Daniels, took his computer, phone and personal financial records from his NY office, the paper said.More news: Sunil Narine smashes 17-ball fifty as Kolkata beat RCB in IPL
The revelation comes as Mueller investigates the flow of foreign money into the Trump campaign and Trump's personal business.
He said agents "broke into" Cohen's Manhattan office, although the search warrants were perfectly legal.
The raid creates a new legal headache for Trump even as he and his attorneys weigh whether to agree to an interview with Mueller's team, which in addition to investigating potential ties between Russian Federation and the Trump campaign is also examining whether the president's actions constitute obstruction of justice. Also seized were communications between Cohen and Trump.
"The attorney general made a bad mistake when he did this. he certainly should have let us know if he was going to recuse himself, and we would have put a different attorney general in", the president said.
It doesn't feel like much of a stretch to me for Trump to explain his decision to have Mueller fired as a way to protect the country. These people have the biggest conflicts of interest I have ever seen.
Senate Democratic leader Chuck Schumer of NY released a statement warning Trump against firing Mueller.
"If [the president] is thinking of using the Federal Bureau of Investigation raid to fire Special Counsel Mueller or otherwise interfere with the chain of command in the Russian Federation probe, we Democrats have one simple message for him: don't", Schumer wrote. "Republicans and Democrats need to make clear that they will not allow President Trump or anyone on his behalf to interfere with or attempt to impede any of these ongoing and serious investigations".