WASHINGTON (Reuters) - The mayor of Washington, D.C., had the slogan “Black Lives Matter” painted in massive yellow letters on a street leading to the White House on Friday in tribute to victims of police brutality as she sparred with U.S. President Donald Trump. Mayor Muriel Bowser’s defiant message came as tensions remained high across the nation over the death of a black man, George Floyd, in Minneapolis police custody nearly two weeks ago, prompting political leaders in that city and elsewhere to announce new restrictions on law enforcement.