FILE - The limousine carrying mortally wounded President John F. Kennedy races toward the hospital seconds after he was shot in Dallas, Nov. 22, 1963. Secret Service agent Clinton Hill is riding on the back of the car; Nellie Connally, wife of Texas Gov. John Connally, bends over her wounded husband; and first lady Jacqueline Kennedy leans over the president. Protective details have grown in size, responsibility and technology over more than a century of the Secret Service protecting presidents. When the commander in chief leaves the White House, they're accompanied by a phalanx of Secret Service officers and agents. (AP Photo/Justin Newman, File)
FILE - The north side of the Alfred Murrah Federal Building in Oklahoma City is seen, April 19, 1995, after it was destroyed by a domestic terrorist's bomb killing 168 people. Protective details have grown in size, responsibility and technology over more than a century of the Secret Service protecting presidents. When the commander in chief leaves the White House, they're accompanied by a phalanx of Secret Service officers and agents. (AP Photo, File)
FILE - Republican presidential candidate former President Donald Trump is surrounded by U.S. Secret Service agents at a campaign rally, Saturday, July 13, 2024, in Butler, Pa. Protective details have grown in size, responsibility and technology over more than a century of the Secret Service protecting presidents. When the commander in chief leaves the White House, they're accompanied by a phalanx of Secret Service officers and agents. (AP Photo/Evan Vucci)
FILE - Cars and buses move along the lane of traffic on Pennsylvania Avenue near the White House in Washington, May 9, 1995, in the most visible tightening of presidential security since the Oklahoma City bombing. Protective details have grown in size, responsibility and technology over more than a century of the Secret Service protecting presidents. When the commander in chief leaves the White House, they're accompanied by a phalanx of Secret Service officers and agents. (AP Photo/Mark Wilson, File)
FILE - Republican presidential candidate former President Donald Trump is covered by U.S. Secret Service agents at a campaign rally, Saturday, July 13, 2024, in Butler, Pa. Protective details have grown in size, responsibility and technology over more than a century of the Secret Service protecting presidents. When the commander in chief leaves the White House, they're accompanied by a phalanx of Secret Service officers and agents. (AP Photo/Evan Vucci)
FILE - A skater rolls past the White House on Pennsylvania Avenue shortly after the thoroughfare was closed to vehicular traffic in May 1995. Protective details have grown in size, responsibility and technology over more than a century of the Secret Service protecting presidents. When the commander in chief leaves the White House, they're accompanied by a phalanx of Secret Service officers and agents. (AP Photo/Joe Marquette, File)
FILE - People gather on Pennsylvania Avenue in front of the White House in Washington, May 20, 1995. Protective details have grown in size, responsibility and technology over more than a century of the Secret Service protecting presidents. When the commander in chief leaves the White House, they're accompanied by a phalanx of Secret Service officers and agents. (AP Photo/Mark Wilson, File)