After paying $4.6 million in January to resolve allegations connected to its work for Ukraine, the law firm Skadden, Arps, Slate, Meagher & Flom stayed largely silent as one of its former partners, Greg Craig, a former top lawyer in the Obama administration, stared down charges connected to that contract.

As Craig’s trial gets underway in Washington, Skadden is closely watching the action—and testifying. One of the firm’s partners, Michael Loucks, a former U.S. attorney for Massachusetts, was called as the first witness for the government.