A former top Border Patrol official was tapped Saturday to be the acting chief of U.S. Immigration and Customs Enforcement. Ronald D. Vitiello takes over from Thomas D. Homan, who had been the acting chief since the start of the Trump administration. Homeland Security Secretary Kirstjen Nielsen announced the move, calling Mr. Vitiello a “well-respected career law enforcement officer” and promised he would be a good advocate for agents and officers.