Lee in May resigned as Secretary of State in order to run for the seat.
Collins, a Hillsborough Republican, previously was running in the CD 15 contest, but dropped out of the race earlier this month to run for state Senate.
“Jay is a warrior, not a career politician or bureaucrat, and I am honored to have his support for my candidacy,” Lee said. “Having grown up in a military family, I know the sacrifices Jay has made and the type of man it takes to run toward danger again and again. Jay Collins will serve the state of Florida well and will bring his fight for our area to Tallahassee. I am honored to give him my full support.”