US Sen. Chris Van Hollen traveled to El Salvador Wednesday seeking to meet with government officials there about Kilmar Abrego Garcia, a man who had been living in his state until he was mistakenly deported by the Trump administration last month to a mega-prison in the Central American nation.

Van Hollen said El Salvador’s vice president told him he couldn’t see Kilmar Abrego Garcia, who was deported on March 15 to El Salvador’s terrorism confinement center, known as CECOT, and that he might be able to arrange a phone call if the U.S. Embassy requests it.

The Kilmar Abrego Garcia case has put Maryland in the national spotlight and tests the power of all three branches of federal government.