A panel of judges in the appellate court in the District of Columbia expressed mixed concerns Monday during oral arguments over a lawsuit involving President Donald Trump’s use of the Alien Enemies Act to deport alleged Venezuelan gang members.

President Donald Trump on Friday downplayed his involvement in invoking the Alien Enemies Act of 1789 to deport Venezuelan migrants, saying for the first time that he hadn’t signed the proclamation, even as he stood by his administration’s move.

U.S. District Court Judge James Boasberg won’t lift his earlier ban on the deportation of immigrants under the Alien Enemies Act, denying a Trump administration request and ruling it likely violated the due process rights of migrants who were deported to El Salvador.