President Donald Trump's previous comments regarding his plan to block immigrants from Muslim countries in the name of national security took center stage in the Fourth Circuit's travel ban hearing Monday.

The 13-judge en banc panel for the U.S. Court of Appeals for the Fourth Circuit grilled both sides' legal arguments for nearly two hours in Richmond, Virginia. The hearing marked the first appellate argument concerning the revised order, issued March 6 after the first one was blocked by a district court in Washington, a decision later upheld by the Ninth Circuit. The Ninth Circuit will hear oral arguments on the revised ban May 15.

The revised order bans entry by immigrants from six majority-Muslim countries. Plaintiffs include refugee and Muslim rights organizations, as well as individuals affected by the order, mostly those with loved ones in the six targeted countries.