And TV comics such as Stephen Colbert, Jimmy Kimmel and Trevor Noah could not contain their excitement.
He is facing a criminal inquiry, which the president has strongly criticised.
It is also unclear why, if Cohen's work for Hannity was innocuous, the two men sought to keep their relationship secret.
With Hannity's photo on the screen, Noah put his hands together as if in prayer, looking up to the sky while mouthing the words "thank you".
"I really think that you should have disclosed your relationship with Cohen when you talked about him on this show", Dershowitz said.
The consequences of Hannity's misstep will be interesting. "Unless...maybe Sean Hannity was thinking about suing himself?" I have many (too many!) lawyers and they are probably wondering when their offices, and even homes, are going to be raided with everything, including their phones and computers, taken.
Lyrid Meteor Shower 2018: How and when to see it this weekend
For the rest of April, you'll have a good chance of seeing some shooting stars as the Lyrid meteor shower comes through this year. The shower will intensify and produce more meteors as Vega climbs higher in the sky, so be mindful of the star's rising time.
Cohen revealed that he had advised the television host within the last 12 months as he sought to fight against a raid of his office and a hotel room by federal prosecutors in Manhattan.
"Michael Cohen has three known clients".
MSNBC's Rachel Maddow said that she was "struggling not to laugh" after hearing the court revelation, and described the situation as "just nuts".
"Pro tip for the president", Colbert also offered, "when your lawyer needs a lawyer, you need a lawyer".
CNN was first out of the gate to land a dig on the conservative heavyweight, running a segment arguing that he should never have enjoyed lawyer-client privilege. He reappeared slouching in an armchair, drinking a glass of red wine, rubbing his stomach, seemingly experiencing pure bliss. This time, the 56-year-old actor likened a sea creature to a popular Fox News host who was caught in a scandal yesterday.
Hannity said Monday that he occasionally turned to Cohen when he had legal questions but that he never paid him to be his attorney.
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Hannity spent the majority of the hour attacking ex-FBI director James Comey, calling him "the most petty human being on earth".
"Are you going to answer any of these questions? And you had the right, by the way, not to have your identity be revealed". "And it's not your baby". But Hannity gets to play with the facts in terms of whether he's journalist or not and he's said both.
The contract in the confidential settlement between Broidy and Bechard included the same aliases - "David Dennison" and "Peggy Peterson" - that were used in a 2016 contract between Trump and Daniels, according to a person familiar with the deal. The client? None other than Sean Hannity!
Michael Cohen, Trump's fiercely loyal and pugnacious lawyer, disclosed Hannity's name through one of his own lawyers at the order of the judge. "I never retained him, received an invoice, or paid legal fees", Hannity said.
In his regular broadcast Monday, Hannity says he had "brief discussions" with Michael Cohen about "legal questions where I wanted his input and perspective".
But even if an attorney-client relationship between Cohen and Hannity did actually exist, it is the client, not the attorney, who controls the disclosure of communication.
CVS Health Corporation (CVS): Watch List Healthcare Stock Buzz
The pharmacy operator reported $1.92 earnings per share for the quarter, beating analysts' consensus estimates of $1.88 by $0.04. Johnson Grp reported 126,439 shares. (NYSE:MD) to report earnings on April, 19. 306,522 are held by Cornerstone Mngmt Hldgs Ltd.