A White House official said President Joe Biden has canceled his plans to travel to Wilmington, Delaware, on Saturday and will instead remain in Washington. The official said Biden was currently receiving a briefing on Afghanistan, where a desperate evacuation of American citizens and Afghan allies is underway after the Taliban’s lightning takeover of the country, fueling fear and pandemonium. Biden’s decision to remain in Washington comes as the State Department warned in an alert Saturday that American citizens are being advised not to travel to the Kabul airport unless they have received individual instructions from a U.S. government representative to do so. While Pentagon officials in Washington declined to elaborate on the potential threats, they said that the airport itself was secure, if Americans are able to reach it. “Our military forces at the gate have the ability to continue to process those that come to the gate,” Army Major …