Washington — President Trump says he wants the new triumphal arch he's commissioning as a gate to Washington, D.C., to be the "biggest one of all" in the world, even though the proposed site is situated along a flight path for nearby Reagan National Airport in Arlington, Virginia.  The Washington Post reported over the weekend that the president wants to build a 250-foot arch, aligning with the 250th anniversary of the country, which would dwarf even the the tallest triumphal arch in the world,