John Robert Moolenaar is an American politician serving as the US representative for Michigan’s 4th congressional district since 2015. 

Born May 8, 1961, in a family of Dutch Americans, Moolenaar earned a Bachelor of Science degree from Hope College. He earned a Master of Public Administration from Harvard University in 1989. He is a chemist and worked at Dow Chemical Company for eight months before entering politics.

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He was elected to the Michigan House of Representatives in 2002, where he served three terms. In 2010, he was elected to the Michigan Senate, where he served one term. He defeated Democrat Andy Neumann in the November 2 general election, 56,634 votes to 32,154.

He served in the Michigan House of Representatives from 2003 to 2008 and the Michigan Senate from 2011 to 2014.

Before his election to the legislature, Moolenaar served on the Midland City Council.

In 2014, Moolenaar ran for the United States House of Representatives seat representing Michigan’s 4th congressional district. He won the Republican primary election in August, defeating Paul Mitchell. He also won the general election in November. He also defeated Jeff Holmes (D), Will Tyler White (Libertarian) and George Zimmer (U.S. Taxpayers) in the November 4 general election.

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Moolenaar and fellow Michigan representative Andy Levin introduced legislation to delay any deportations of Iraqis to Iraq for two years.

In December 2020, he signed an amicus brief before the United States Supreme Court in Texas v. Pennsylvania. This sought to overturn the 2020 United States presidential election results. 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.