WASHINGTON (AP) — Federal law enforcement authorities are preparing for one of Washington, D.C.'s, largest and most complex security operations as the nation’s capital gears up to celebrate the 250th anniversary of the nation’s freedom. With rising political violence, including recent incidents near the White House, and a president who enjoys being at the center of public pomp yet has repeatedly faced attempts on his life, a major security challenge awaits. “It comes as no surprise to […]