An en banc federal appeals court Tuesday indicated it will rule in favor of the House’s ability to go to court against the executive branch, as it heard arguments over the significant legal question that’s sure to land before the U.S. Supreme Court.

Judges on the U.S. Court of Appeals for the D.C. Circuit pressed Justice Department appellate attorney Hashim Mooppan over the administration’s stance that the House lacks both the ability to sue Trump administration officials or arrest them under its inherent contempt powers. They also questioned House general counsel Douglas Letter about whether lawmakers actually could challenge a presidential order that redirected military funds for border wall construction, and how they could narrow that ruling.