Judge Thomas Griffith is retiring from the judiciary—but not without leaving his mark on legal fights involving the Trump administration.

The conservative-leaning jurist on the U.S. Court of Appeals for the D.C. Circuit has presided over major fights between the House of Representatives and the Trump Justice Department in recent months, crafting rulings with sweeping implications for the political battles. And on Monday, the day before he is set to retire, Griffith authored opinions in high-profile cases tied to the current administration.