A nonprofit watchdog group on Thursday asked Congress and the Justice Department to investigate whether Michael Cohen, a personal lawyer to President Donald Trump, broke the law by accepting money last year from companies with business before the administration without disclosing it.

In a letter delivered Thursday, Public Citizen asked investigators to examine whether Cohen failed to comply with laws requiring lobbyists and foreign agents to disclose their business dealings. Several corporations, including Novartis and AT&T, said this week that they made payments to Cohen’s company, Essential Consultants, in return for his insights into the Trump administration.​

Cohen “has actively solicited clients based on his access to Trump and administration officials; received exorbitant payments from foreign and domestic clients with business pending before the administration; and he has also provided ample yet unspecified services to his clients in exchange for those payments,” the group wrote.

Novartis and AT&T revealed they did business with Cohen after the companies were named in a document distributed by Michael Avenatti, a lawyer representing adult film actress Stormy Daniels. Daniels, whose legal name is Stephanie Clifford, is suing to be released from a contract that paid her $130,000 to keep quiet about an alleged sexual relationship with Trump.