Walker said Wednesday after touring a sensor manufacturer in Middleton that he wants to grow the program in stages, so there is capacity for all the students who wish to participate.
The program allows for students to use a taxpayer subsidy to attend a private school. The program currently has a statewide enrollment cap of 1,000 students outside of Milwaukee and Racine.
Walker's opponent for re-election, Democrat Mary Burke, opposes the statewide voucher program.
Burke says she would eliminate the statewide voucher program if elected, but allow it to continue in Milwaukee and Racine.