Rep. Ro Khanna sent a letter to the House Energy and Commerce Committee Wednesday asking them to hold a hearing about payments made by AT&T to Essential Consulting, LLC, the entity formed by President Donald Trump’s lawyer Michael Cohen.

The organization is alleged to have been used by Cohen as a slush fund for companies hoping to gain access to the president. The letter was first reported by Fast Company.

“The payments raise serious questions of public trust,” wrote Khanna, who also called for AT&T to release all documents related to its connection with Cohen.