Republican Randy Brock will not seek a rematch with Gov. Peter Shumlin.

Brock, a former state auditor and state senator from Franklin County, was runner-up to Shumlin in the 2012 general election. Brock issued a statement Sunday afternoon saying he believed it was in the best interest of his family to remain out of the race.

"This will be the first time in over ten years that my name will not be on the ballot," Brock said in a statement. "I will miss the excitement of the campaign trail, the joy of meeting hundreds of new friends every year, the challenge of formulating public policy and the satisfaction of having played a small part in improving the lives and livelihoods of thousands of our citizens. But I believe that this is the right decision for me and my family."

Brock's decision could have an immediate impact on the potential candidacy of travel agency owner Scott Milne, who has said his bid was largely contingent on a Republican primary with Brock. If Milne decides not to run it could leave Emily Peyton as the only name on the GOP ballot for governor. The party has not supported her candidacy.

Vermont Republican Party chairman David Sunderland said Sunday that in addition to Milne, there were others in the GOP who were waiting for Brock's decision and could decide to run.

Sunderland said he had encouraged Brock and Milne to run and said he was disappointed by Brock's choice.

Milne said Sunday he, too, was "disappointed" by Brock's decision but hasn't ruled out a run.

Milne said he would consider a primary run against Peyton alone, though Brock's decision made it less likely.

"Short of winning, my intent was to have an effect on the discussion," Milne said, saying a primary with Brock would have focused on bringing leadership to the governor's office.