The United States federal government shutdown from midnight EST on December 22, 2018, until January 25, 2019 was the longest government shutdown in history and the second and final federal government shutdown involving furloughs during the presidency of Donald Trump. It occurred when the 115th Congress and Trump could not agree on an appropriations bill to fund the operations of the federal government for the 2019 fiscal year, or a temporary continuing resolution that would extend the deadline for passing a bill. The Antideficiency Act prohibits federal departments or agencies from conducting non-essential operations without appropriations legislation in place. As a result, nine executive departments with around 800,000 employees had to shut down partially or in full, affecting about one-fourth of government activities and causing employees to be furloughed or required to work without being paid. The Congressional Budget Office estimated the shutdown cost the American economy at least $11 billion USD, excluding indirect costs that were difficult to quantify.

The 116th United States Congress was a meeting of the legislative branch of the United States federal government, composed of the Senate and the House of Representatives. It convened in Washington, D.C., on January 3, 2019, and ended on January 3, 2021, during the final two years of Donald Trump's presidency. Senators elected to regular terms in 2014 finished their terms in this Congress, and House seats were apportioned based on the 2010 census.