A federal judge in Washington, D.C., grappled on Thursday with the U.S. House of Representatives’ right to sue President Donald Trump in his plan to redirect billions in federal dollars to build a wall on the U.S.-Mexico border.

U.S. District Judge Trevor McFadden, a Trump appointee to the Washington, D.C., federal trial court, was hearing argument in the U.S. House’s challenge to Trump’s plan. It was the second time since last Friday that lawyers have tangled in court over the issue.