Portland Republicans will hold a special caucus Thursday to select a replacement for the Senate District 27 nominee.

Mark Lockman, who had won the nomination in an uncontested primary on June 14, withdrew as the nominee for the district, said Eric Lusk, chairman of the Cumberland County Republican Committee.

The special caucus will be held at 6 p.m. July 14 at The Portland Club on State Street. Republicans registered in District 27 are eligible to vote.

Adam Pontius of Bramhall Street currently is the only declared candidate interested in the nomination.

District 27 consists of the Portland Peninsula east of I-295, and north through the Oakdale, Woodfords, and Back Cove neighborhoods and the area east of Forest Avenue to Morrill’s Corner and then East Deering (east of Allen Avenue). The district also includes the Portland islands.