Two Democratic senators are seeking to learn more about Rudy Giuliani’s role in shielding Oxycontin-maker Purdue Pharma from criminal charges in the mid-2000s.

Sens. Sheldon Whitehouse of Rhode Island and Maggie Hassan of New Hampshire asked the Justice Department Friday to provide documents related to Giuliani’s involvement in a 2007 decision by the Bush administration to not charge Purdue executives with misleading the public over the abuse potential of Oxycontin. Giuliani is now President Trump’s personal attorney and representing him in special counsel Robert Mueller’s probe into Russian meddling in elections.