Former Rep. Connie Mack (R-Fla.) won't run for his old seat, which Rep. Trey Radel (R-Fla.) resigned from earlier this week.
Mack, who served four terms in Congress before an unsuccessful Senate bid in 2012, had been weighing a bid for his old seat in Southwest Florida, but ruled it out in a Wednesday statement.
Republicans expect a crowded field for the special election to replace Radel, who resigned after being busted for cocaine. The district is heavily Republican.
Former Hill staffer Chauncey Goss (R), Florida state Sen. Lizbeth Benacquito (R), former state Sen. Paige Kreegel (R) and Naples Vice Mayor Gary Price (R) are all considering bids, while former Purdue University basketball player Kurt Clawson (R) is already in the race.