In 2006, Norquist was selected by President George W. Bush to be Chief Financial Officer at the Department of Homeland Security. He served in this position from June 1, 2006 to December 1, 2008.[10][11] As the first person to be confirmed by the Senate for that position, he took steps to address widespread problems with DHS's financial statements.[12]
In 2008, Norquist joined Kearney & Company, a certified public accounting firm, as a partner.[13]
On March 20, 2017, President Donald Trump announced his intention to nominate Norquist to be Under Secretary of Defense (Comptroller)/Chief Financial Officer in the Department of Defense.[8] He was confirmed by the U.S. Senate on May 25, 2017 by unanimous consent[14] and began serving on June 2, 2017.[15] As Comptroller, he oversaw DoD's first-ever department-wide audit of $2.7 trillion in assets, which involved over 1,000 outside auditors and discovered "major flaws" but no "major cases of fraud or abuse."[16]
Deputy Secretary of Defense
Following the December 2018 resignation of Jim Mattis as secretary of defense, deputy secretary Patrick Shanahan was made the acting secretary of defense and Norquist was made acting deputy secretary.[17] He served as acting deputy for several months before being formally nominated for the position. After Shanahan suddenly resigned on June 18, 2019, President Trump announced his intention to nominate Army secretaryMark Esper to be defense secretary.[18] On June 21, the president announced his intention to nominate Norquist to be deputy secretary. His nomination was sent to the Senate on July 23, and he was confirmed by voice vote on July 30, 2019, after having acted in the role for nearly seven months.[19]
Norquist pledged to shake up the defense budget and to place a high priority on funding research and development of cutting-edge technologies such as hypersonics and artificial intelligence.[20] On August 2, 2019, he signed a memo to department leaders ordering a comprehensive, "zero-based" program and budget review for 2021 to 2025.[21]
Acting Secretary of Defense
Norquist became the acting secretary of defense on January 20, 2021, and served in that role until Lloyd Austin, the Biden administration's nominee, was confirmed by the Senate on January 22.[22][23][24][25]