The C-32 (757) can easily land within 6,000 feet and remember there is a Gulfstream 5 that can do it as well. C-32 has higher performing engines and brakes than a normal 757.
The TFR is dubbed as a POTUS TFR, and is centered about Vegas. AF1 can just land at their gargantuan runway, and take a lesser “af1” chopper or whatever to any nearby satellite airport.