Jeanine Pirro, the U.S. attorney in Washington, blamed shoddy construction, contradicting President Trump's pet theory. Mr. Trump said he disagreed "100%" with her.
Federal prosecutors charged a man returning to the United States with obstruction because he gave them a passcode that erased his smartphone during a customs search.
Federal agents are arresting spouses of Americans, tech workers and others whose visas have expired, including many who have active applications to stay in the country.