Rep. Doug Collins expected to run for Senate

Rep. Doug Collins (R-Ga.) is planning to announce a run for the Senate, according to multiple sources, challenging appointed GOP Sen. Kelly Loeffler and complicating Republicans’ path to holding onto a battleground Senate seat this year.

Loeffler and Collins will both be running to complete the term of former Georgia Sen. Johnny Isakson, who resigned at the end of last year due to health concerns. The election is an all-party contest in November, with the top-two challengers facing off in a January runoff if no candidate tops 50 percent of the vote.

The announcement is expected to come soon, according to sources. Collins' office declined to comment.