"I do believe that he has information about Mr. Trump that would be of interest both in Washington as well as New York state," Cohen's attorney Lanny Davis said Tuesday night on CNN's Cuomo Prime Time, a show hosted by Chris Cuomo, brother of New York's governor.
The state's investigation follows Underwood's lawsuit alleging Trump illegally tapped his Trump Foundation to settle legal disputes, help his campaign for president and pay for personal and business expenses, which included spending $10,000 on a 6-foot (1.8-meter) portrait of himself.
The attorney general's office is seeking $2.8 million in restitution and other unspecified penalties in its civil suit. It said that it had referred to its findings to the IRS and the Federal Election Commission for possible further action.
A spokesperson for Underwood declined to discuss the state's new subpoena and noted that Cuomo's administration would need to refer the tax department investigation to it before criminal charges could be pursued.
"We cannot comment on potential or ongoing investigations," said spokeswoman Amy Spitalnick. "As our lawsuit against the Trump Foundation illustrates, we will hold Donald Trump and his associates accountable for violations of state law, and will seek a criminal referral from the appropriate state agency as necessary."