Jeffrey Bossert Clark is an American lawyer who was Assistant Attorney General for the Environment and Natural Resources Division from 2018 to 2021. In September 2020, he was also appointed acting head of the Civil Division. In 2020 and 2021, Clark allegedly helped then-president Donald Trump attempt to overturn the 2020 presidential election. Clark's actions in that endeavor were reviewed by the District of Columbia Bar – the entity authorized by law to pursue attorney discipline and disbarment in the District of Columbia – which recommended discipline to the DC Court of Appeals in July 2022. He was identified as an unindicted co-conspirator in the federal prosecution of Donald Trump over attempts to overturn the 2020 election. On August 14, 2023, he was indicted along with 18 other people in the prosecution related to the 2020 election in Georgia.

The United States Department of Justice Civil Division represents the United States, its departments and agencies, members of Congress, cabinet officers, and other federal employees. Led by the United States Assistant Attorney General for the Civil Division, the Division's litigation reflects the diversity of government activities, involving, for example, the defense of challenges to presidential actions; national security issues; benefit programs; energy policies; commercial issues such as contract disputes, banking insurance, patents, fraud, and debt collection; all manner of accident and liability claims; enforcement of immigration laws; and civil and criminal violations of consumer protection laws. Each year, Division attorneys handle thousands of cases that collectively involve billions of dollars in claims and recoveries. The Division confronts significant policy issues, which often rise to constitutional dimensions, in defending and enforcing various Federal programs and actions.