Md., tells NPR's Ayesha Rascoe about developments following his trip to El Salvador to meet with Kilmar Abrego Garcia.

Saturday saw more demonstrations in scores of cities as people expressed their opposition to the Trump administration.

Matthew Bunn, a professor specializing in nuclear arms control at Harvard's Kennedy School, tells NPR's Ayesha Rascoe about concerns over a new nuclear arms race as the U.S. looks increasingly inward.