Secretary of State Antony Blinken on Sunday revealed that 300 Americans remain in Afghanistan and are awaiting evacuation amid a heightened terror threat near the airport. “We have about 300 American citizens left who have indicated to us that they want to leave. We are very actively working to help them get to the airport, get on a plane, and get out of Afghanistan,” President Joe Biden’s top diplomat said during an ABC News interview on Sunday. After meeting with Biden and other White House officials on Saturday, Blinken said that U.S. officials are making significant attempts to get the remaining Americans out of Afghanistan, coming two weeks after the Taliban took over the country after a blistering offensive that lasted only days. Biden and other officials set an Aug. 31 deadline for all troops to leave Afghanistan, raising questions about whether the administration can successfully evacuate any remaining Americans …