Monday's hearing before U.S. District Court Judge Kimba Wood in NY was about what should happen to seized material from Cohen.
On the radio, Hannity did not directly address his lack of disclosure but hinted at a possible defense - that he did not consider himself a formal client of Cohen's. "Unless maybe Sean Hannity was thinking of suing himself?"
The search sought information on a variety of matters, including a $130,000 payment made to porn star Stormy Daniels, who alleges she had sex with a married Trump in 2006.
Colbert noted that Cohen's only other two clients are President Trump and Elliot Broidy, the deputy finance chairman for the RNC.
In his Monday radio show, Hannity said he had used eight attorneys in his life and insisted he "never retained" Cohen "in the traditional sense". On Monday evening, Hannity downplayed the legal relationship, saying, "Cohen never represented me in any legal matter".
But Hannity said he asked Cohen "brief" legal questions, adding that may have handed Cohen $10 and said, "I want privilege to cover me about this conversation".
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But there is an even bigger hole in Hannity's explanation: Why, as he railed against Federal Bureau of Investigation raids of Cohen's office, home and hotel room last week, did Hannity not disclose to viewers and listeners that his communications with Cohen could have been among the materials seized?
"As I have been warning, Mueller is out to get the president and it appears at any cost", Hannity said last Monday on his Fox News program, hours after news of the raid broke.
"My discussions with Michael Cohen rose to any level that I needed to tell anyone that I was asking him questions", he said. "It's perfectly logical to think that if you're friendly with somebody, that you might ask him for legal help", co-host Brian Kilmeade said.
Hannity did fail in not telling his viewers he had some kind of relationship with Cohen.
The firebrand commentator is a close informal adviser to Trump, who has urged the public to watch Hannity's show, during which he regularly attacks the special counsel investigation into Russia's interference in the 2016 campaign.
"This morning, Michael Cohen was forced to reveal the name of a mystery third client". And to be absolutely clear, they never involved any matter, any - sorry to disappoint so many - matter between me, a third party, a third group, at all. Cohens lawyers did not detail the type of legal work he did for Hannity.
This implies that he did not disclose his Cohen connection to management, possibly running afoul of Fox policy. "It had to do with real estate and nothing political", Hannity told Dershowitz.