Chip Roy vs. Matt McCall: Texas Republican U.S. House District 21 runoff results

U.S. Rep. Lamar Smith, R-San Antonio, set off a scramble when he announced he was retiring from representing the 21st Congressional District, which runs from South Austin to San Antonio and extends westward into the Hill Country.

The first round of this race drew 18 Republican candidates. With the GOP field winnowed down to Chip Roy and Matt McCall — Smith has endorsed Roy since the March primary — the choice was between two conservatives with ample stylistic differences.