He attended then Oriel College at the University of Oxford on a Rhodes Scholarship and received a Bachelor of Arts in theology.
Sauer worked as a litigation associate at Cooper & Kirk and then became an Assistant United States Attorney for the Eastern District of Missouri.
[9] On December 10, 2020, as Solicitor General Counsel of Record, Sauer signed the "Motion of States of Missouri, Arkansas, Louisiana, Mississippi, South Carolina, And Utah To Intervene And Proposed Bill of Complaint In Intervention" in an attempt to overturn the 2020 United States presidential election.
[14] In July 2023, Sauer testified before a U.S. House Subcommittee as the Louisiana Department of Justice Special Assistant Attorney General.
[20] In November 2024, President-elect Donald Trump announced that he intends to nominate Sauer to serve as the next solicitor general of the United States.