[3] Moolenaar worked at Dow Chemical Company as a chemist for eight months before entering politics.

He won the Republican nomination in the August 5 primary against Paul Mitchell and Peter Konetchy.

He defeated Jeff Holmes (D), Will Tyler White (Libertarian) and George Zimmer (U.S. Taxpayers) in the November 4 general election.

For the 118th Congress:[9] In December 2020, Moolenaar was one of 126 Republican members of the House of Representatives to sign an amicus brief in support of Texas v. Pennsylvania, a lawsuit filed at the United States Supreme Court contesting the results of the 2020 presidential election, in which Joe Biden defeated[14] incumbent Donald Trump.

The Supreme Court declined to hear the case on the basis that Texas lacked standing under Article III of the Constitution to challenge the results of an election held by another state.