Transcript for Cohen fights back against Stormy Daniels' lawyer

Back home now and the latest on Michael Cohen after new questions were raised about the millions he was paid by companies would want help with the trump administration. He is demanding action against the leaks and attacking Michael avenatti for getting some facts wrong. Reporter: That's right. Looks like several companies wanted to get into business with Michael Cohen to possibly capitalize on his long relationship with the president. This as Cohen's lawyers are disputing some of the transactions being linked to their client saying the lawyer who released them, stormy Daniels' attorney, Michael avenatti, has made numerous mistakes. This morning the treasury department launching an investigation into the possibility financial records tied to the president's personal attorney Michael Cohen may have been illegally leaked. Any response to avenatti. His document is inaccurate. Reporter: Cohen responding to questions about stormy Daniels' attorney Michael avenatti who posted some financial details about a company Cohen started shortly before the election, sential consultants. Avenatti allegations Cohen used that shell company to facilitate the Daniels payment in a hush agreement but also for a consulting practice that had transactions totaling at least 4 million dollars shortly before the election into 2018. Among the web of companies that hired Cohen, AT&T, which allegedly paid him at least $200,000 and has a major merger pending before the justice department. The company says they paid to get, quote, insights into understanding the new administration. Pharmaceutical giant novartis acknowledges they paid Cohen $1.2 million. A company spokesman says they were promised, quote, access to the new administration, also potentially troubling for Cohen, $500,000 avenatti said Cohen received from Columbus nova, a company with deep ties to Putin ally Viktor vekselberg, a Russian billionaire who reportedly attended the trump inauguration and according to "The New York Times" was questioned by the Mueller team. Now you have the right hand of the president, right hand of Mr. Trump, all of a sudden starts taking all of this money from all of these multinational corporations for god knows what and the American people deserve to know what it was for. Reporter: Now, Columbus nova tells ABC news it hired Cohen as a business consultant for possible real estate deals but had nothing to do with vekselberg. As for those alleged mistakes by avenatti Cohen says he public blushed several linking them to a Michael Cohen but it's a different Michael Cohen, not the president's attorney. Avenatti is characterizing what he put out as being 99% right. But those transactions were different Michael Cohen. A different Michael Cohen. Growing concerns about the

This transcript has been automatically generated and may not be 100% accurate.