Michael Cohen reportedly plans to 'say things that will give you chills' in his congressional testimony

President Trump's former attorney, Michael Cohen, may not be able to discuss certain topics during his upcoming congressional testimony — but he still has plenty to say.

Cohen's testimony next month will be "highly restricted" so that he doesn't interfere with Special Counsel Robert Mueller's ongoing investigation into Russian interference in the 2016 election, The Wall Street Journal reported Tuesday. Therefore, Cohen won't dive into Russia-related topics he has discussed during his 70 hours of interviews with Mueller.

At the same time, the Journal reports that the hearing, which will focus more on Cohen's personal experience working as Trump's attorney, could still be "explosive." In fact, a source close to Cohen said that he will "tell the story of what it's like to work for a madman, and why he did it for so long," adding that he's "going to say things that will give you chills."

Cohen pleaded guilty in August to violating campaign finance laws, saying he made hush payments to two women who claim they had affairs with Trump years before he ran for president. Trump, who Cohen claims directed him to make the payments, has accused Cohen of making up a story to get a lighter sentence. Cohen has also pleaded guilty to lying to Congress about how long Trump negotiated a business deal in Russia.

Cohen's public hearing on Capitol Hill will take place on Feb. 7.