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Are we taxpayers footing the bill or is his campaign paying for it?

The USSS is the government agency in charge of these TFRs.

Therefore all of this is paid for by taxpayers.

Temporary Flight Restrictions

A Temporary Flight Restriction (TFR) is a restriction on an area of airspace due to the movement of government VIPs, special events, natural disasters, or other unusual events. On any given day, there are typically several TFRs in place across the National Airspace System (NAS). Most non-VIP TFRs are small in scope, in non-critical locations, or allow for some aspect of general aviation to operate within them, albeit with some restrictions.

However, some TFRs do have a significant restrictive impact on general and business aviation. The most common of these are VIP TFRs, which are issued in association with the movements of the President and the Vice President (and, potentially, during campaign season, the presidential and vice-presidential candidates). Not quite as common are special event TFRs, such as those established each year in association with the Super Bowl or the UN General Assembly.

The dimensions, timing, and level of restriction for each TFR vary. For VIP TFR’s, these determinations are made by the United States Secret Service (USSS), in coordination with FAA Security. Once finalized, TFR information is typically distributed via Flight Data Center (FDC) Notice to Airmen (NOTAM) in advance of the event.

For additional information about the types of TFR, review the information below:

VIP TFRs

There are two basic types of VIP TFRs:

10/30nm VIP TFRs, reserved for use in association with Presidential movement,
3nm VIP TFRs, used for Vice Presidential movement or movement by other lower-ranking government officials.

These TFRs are governed by FAR 91.141 and are generally not made available to the public until two or three days before the event.

VIP TFRs are normally set up as one or more rings of airspace, surrounding the VIP, which become active for a specific amount of time. The normal arrangement is to have one ring covering the VIP’s arrival and departure location(s) and another covering the area where the VIP will be between arrival and departure. While these rings are stationary, there are occasions where “rolling” TFRs are created to accommodate a moving event (such as one on a train or bus).
10/30nm VIP TFRs

In the case of Presidential movement, the TFR is usually comprised of an outer 30nm ring and one or more 10nm inner rings. However, the dimensions and, even the shape, of the rings are sometimes altered to suit specific needs. For example, some TFRs are structured so that the outer ring consists of the lateral limits of a particular airport’s Class B airspace, with one or more inner rings of perhaps 8nm or 12nm, as needed.

The inner ring(s) constitute the most significant challenge to general and business aviation, since they are almost always inaccessible to general aviation aircraft. This is primarily due to the fact that general aviation aircraft are not subject to TSA passenger and aircraft screening.

The result is that GA aircraft cannot fly through these areas below 18,000 feet and any airports within these areas are unavailable to GA aircraft during the specified times. In addition, these “no fly” areas may result in required reroutes being issued to move aircraft away from them.

There are occasional exceptions that will allow certain GA aircraft to penetrate the inner ring(s). In some cases, the USSS will agree to set up “gateway” airports, at which GA aircraft can be screened before proceeding into the TFR. In other cases, GA aircraft are permitted into the inner ring(s) only after obtaining TSA waivers, sometime used in combination with gateway airports. However, these exceptions are relatively rare and are normally made for TFRs that impact multiple airports for several days.

On other occasions, a TFR might be structured with a “cut-out” to allow operations into an airport that lies just inside the inner ring. This happens quite often for Teterboro Airport (TEB) when TFRs are placed over the New York City area. In these cases operators need to be aware that certain approaches and departures may not be available for the airport in the cut-out.

The outer ring(s), normally 30nm in diameter, are much less problematic for general and business aviation. Between this outer limit and the inner ring(s), GA aircraft are permitted as long as they are on IFR flight plans and in communication with air traffic control. However, aircraft cannot loiter in this airspace and certain other types of activities, such as flight training, practice approaches, and sightseeing flights, are not permitted within this area.
3nm VIP TFRs

In the case of Vice Presidential movement, TFRs normally consist of one or more 3nm rings and no outer ring. These TFRs are less restrictive for GA aircraft, allowing access to aircraft that are on IFR flight plans and in communication with ATC – restrictions very similar to those in the 30nm outer rings discussed above.

However, when an airport is contained within a 3nm-type TFR, airport operations are typically halted for a short period of time while the VIP is at the airport or is departing or arriving. As a result, operators flying into an airport sitting under a 3nm ring can expect minor delays during the TFR’s active times.

http://www.nbaa.org/ops/airspace/alerts/notams/temporary-flight-restrictions.php#vip