If you look up the NOTAMS for IAD you see this:
01/075 - AIRSPACE SEE FDC 7/2906 ZDC 91.141 VIP TFR. 20 JAN 14:00 2017 UNTIL 21 JAN 00:30
2017. CREATED: 10 JAN 18:34 2017
01/074 - AIRSPACE SEE FDC 7/2815 ZDC 91.141 VIP TFR. 21 JAN 14:00 2017 UNTIL 21 JAN 17:30
2017. CREATED: 10 JAN 18:24 2017
!FDC 7/2906 ZDC PART 1 OF 9 DC..AIRSPACE WASHINGTON, DC.. TEMPORARY FLIGHT RESTRICTIONS. JANUARY 20, 2017. PURSUANT TO 49 USC 40103(B), THE FEDERAL AVIATION ADMINISTRATION (FAA) CLASSIFIES THE AIRSPACE DEFINED IN THIS NOTAM AS 'NATIONAL DEFENSE AIRSPACE'. PILOTS WHO DO NOT ADHERE TO THE FOLLOWING PROCEDURES MAY BE INTERCEPTED, DETAINED AND INTERVIEWED BY LAW ENFORCEMENT/SECURITY PERSONNEL. ANY OF THE FOLLOWING ADDITIONAL ACTIONS MAY ALSO BE TAKEN AGAINST A PILOT WHO DOES NOT COMPLY WITH THE REQUIREMENTS OR ANY SPECIAL INSTRUCTIONS OR PROCEDURES ANNOUNCED IN THIS NOTAM: A) THE FAA MAY TAKE ADMINISTRATIVE ACTION, INCLUDING IMPOSING CIVIL PENALTIES AND THE SUSPENSION OR REVOCATION OF AIRMEN CERTIFICATES; OR B) THE UNITED STATES GOVERNMENT MAY PURSUE CRIMINAL CHARGES, INCLUDING CHARGES UNDER TITLE 49 OF THE UNITED STATES CODE, SECTION 46307; OR C) THE UNITED STATES GOVERNMENT MAY USE DEADLY FORCE AGAINST THE AIRBORNE AIRCRAFT, IF IT IS DETERMINED THAT THE AIRCRAFT POSES AN IMMINENT SECURITY THREAT. 1701201400-1701210030 END PART 1 OF 9
There are 8 more parts, but I'll spare you the details.