Thousands of employees returned to the FDA's headquarters Monday to find overflowing parking lots, long security lines and makeshift office spaces without chairs and other basic supplies. The FDA is the latest agency scrambling to meet the Trump administration's return-to-office mandate, part of a flurry of actions — including firings and buyouts — intended to radically shrink the federal workforce. Monday was the first day that all rank-and-file FDA staffers were required to report to offices, including the agency's 130-acre campus just outside Washington.