McCormick was born in Las Vegas in 1968 and graduated from Central Catholic High School in Portland, Oregon, in 1986.

[8] With Rob Woodall not running for reelection to the United States House of Representatives for Georgia's 7th congressional district in the 2020 elections, McCormick announced his candidacy.

[10] Following redistricting due to the 2020 U.S. census, McCormick announced his candidacy in the 2022 elections for the newly-redrawn Georgia's 6th congressional district, which became much more Republican-leaning.

[16][17] In December 2023, fellow Georgia Republican Representative Marjorie Taylor Greene accused McCormick of grabbing her by the shoulders and shaking her, following a public spat between the two.

McCormick said he apologized for the interaction and despite an investigation by the Speaker of the House including a review of surveillance footage and dozens of witnesses, her allegations could not be corroborated.

[21]In January 2025, McCormick cosponsored fellow GOP House member Eric Burlison's bill recognizing personhood as starting at conception.

[32] McCormick was the runner up of the seventh season of the initial run of American Gladiators, losing in the final to Pat Csizmazia.