The Justice Department on Monday sued Texas Gov. Greg Abbott over a newly installed floating barrier on the Rio Grande that is the Republican’s latest aggressive tactic to try to stop migrants from crossing into the U.S. from Mexico. The lawsuit asks a federal judge in Austin to force Texas to remove a roughly 1,000-foot (305-meter) line of bright orange, wrecking ball-sized buoys that the Biden administration says raises humanitarian and environmental concerns. The suit claims that Texas unlawfully installed the barrier without permission between the border cities of Eagle Pass and Piedras Negras, Mexico. The buoys are the latest...