President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE on Thursday granted a posthumous pardon to Zay Jeffries, a metallurgist and mining engineer who contributed to the Manhattan Project, over his 1948 conviction for violating the Sherman Act.

A statement from the White House said that Jeffries's contributions to the U.S. military during World War II following his initial indictment on unlawful anticompetitive conduct merited a pardon for Jeffries, who was fined but never imprisoned for the conviction.

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"One of America’s leading scientists, Dr. Jeffries was crucial to the United States war effort in World War II. His efforts enabled the United States to develop artillery shells capable of piercing the armor of German tanks, and his contributions to the Manhattan Project helped end the war in the Pacific theater," the White House said.

"Although indicted in 1941, Dr. Jeffries proved vital to the war effort prompting Secretary of War Stimson to take the extraordinary step of requesting, with President Roosevelt’s approval, that the Attorney General defer any prosecution until after the war," the statement continued.

The Manhattan Project, the U.S. code name for the development of the first atomic bomb, is widely credited with ending the war in the Pacific Theater in 1945. Two atomic bombs were dropped on the Japanese cities of Nagasaki and Hiroshima, killing thousands.

Trump's interest in the case was spurred by Sen. Lindsey Graham Lindsey Olin GrahamLincoln Project mocks Lindsey Graham's fundraising lag with Sarah McLachlan-themed video The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (R-S.C.). Former Rep. Trey Gowdy Harold (Trey) Watson GowdySunday shows preview: Election integrity dominates as Nov. 3 nears Tim Scott invokes Breonna Taylor, George Floyd in Trump convention speech Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (R-S.C.), now working with the White House in its defense against Democrats' impeachment efforts, also was involved in getting Jeffries's case before the president, according to the statement.