PHOENIX (AP) - Maricopa County estimates the special election to replace former Rep. Trent Franks will cost $3.5 million, but the Legislature is moving to authorize $1 million less than that.

The Senate Judiciary Committee approved $2.5 million on Thursday in the first step to appropriating the cash. Sen. Judy Burges says the county can always come back for more.

That may happen, but Arizona Secretary of State spokesman Matt Roberts said the county's taxpayers may be on the hook.

RELATED: Who will replace Trent Franks?

The costs are for a Feb. 27 primary and an April 24 general election.

Thirteen Republicans and three Democrats filed enough signatures to qualify. They'll appear on the primary ballot barring a successful court challenge.

Each party's top vote-getter moves on to the general election.

Franks resigned Dec. 8 amid sexual harassment allegations.