In case anyone is interested in more detail of what happens when an aircraft is intercepted for violating the presidential TFR (temporary flight restriction), I attended a pilot briefing in Bedminster tonight. It was put on by a local pilot association, the head of the Allentown TRACON (they control a huge chunk of airspace in Eastern PA/Western NJ, the secret service agent responsible for the team who handles airspace security over the president, and a Coast Guard pilot who is currently on duty flying intercepts in NJ. The same air crews follow the president around, so they're normally based in DC, but could be here, Florida, NYC, wherever.
Since the inauguration, there have been over 130 TFR violations when Trump has been at the golf course, half resulting in military intercepts, the rest generally resulting in the aircraft being tracked until touchdown, where it is met by local police, who hold the pilot until a secret service agent gets there for the interview. 130 violations is an embarrassment (hence the seminar), because while the TFR is an enormous pain in the butt, there is no excuse for not knowing when the TFR is in effect. That said, the top three excuses cited by pilots have been 'I didn't know the TFR was in effect', 'The Garmin gave me bad directions', and "I was just flying around the airport pattern, I know I was too low to show up on radar'. New information (to me) was that whenever the president is here, there is airborne radar monitoring the TFR from afar. One might normally be below the radar at 1200 feet or so, but they assured us that if the president is in Bedminster, they know if your wheels leave the runway. They didn't talk about what kind of sanctions were being imposed, but as I'd noted in a post above, 'it depends'.
Interception of small aircraft (which have accounted for 90% of the violations) is normally done by an unarmed Coast Guard helicopter, flying out of Somerset Airport. The copters actually have a digital message board on the right side of the fuselage, so that they can pull alongside the errant aircraft and type out instructions to the pilot if they aren't able to establish radio contact. The armed fighters (which could be F15's, F16's, or F22's--all are used at different times) are often more of a backup, in case the helicopter doesn't immediately get the desired response from the trespassing aircraft. This coming weekend, F22's will be on patrol. At times, the fighters may get there first, but they have a hard time slowing down enough to pull along side a light plane. There will always be two fighters; you won't see the one on your six. The fighters can be VERY persuasive in getting a light plane to alter course. There were a bunch of questions from the audience about what kind of screw up would it take to actually get shot down, and while the answers were evasive, the secret service did say that such a decision could only come down from very high up--they'd normally try to get a quick decision from the Secretary of Defense, and if he wasn't available, the call tree didn't go down many levels at all, like only down to a four star.