Flags are to be flown at half-staff for 30 days from the day of a current or former president’s death “on all buildings, grounds, and naval vessels of the Federal Government in the District of Columbia and throughout the United States and its Territories and possessions,” as codified in the Office of the Federal Register in 1954.

President-elect Donald Trump railed against the order for American flags to be flown at half-staff to honor the late President Jimmy Carter, complaining that they will be in that position “for the first time ever during an Inauguration of a future President.