Homeland Security Secretary Alejandro Mayorkas was repeatedly pressed on whether a
terrorist attack is imminent in the U.S. but he declined to say, instead assuring lawmakers he is “vigilant.” Mr. Mayorkas, speaking just before the start of Senate impeachment proceedings against him, also wouldn’t say whether people on the government’s terrorist watchlist have been caught and released and are roaming free in the U.S. Instead, he said those whose identities trigger the watchlist can be “priorities” for detention in cases.