U.S. Rep. Sam Johnson (R-Plano) announced he would not seek re-election in 2018. Johnson won a special election for the House seat in 1991, succeeding former U.S. Rep. Steve Bartlett, who had been elected mayor of Dallas.

The district lies entirely within Collin Co. and includes all of Allen, McKinney, Melissa and the Collin Co. portions of Dallas, Frisco, Plano, Prosper and Richardson .This heavily Republican open seat is likely to be determined by the 2018 Republican primary (runoff) election.

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