Former South Carolina Gov. Mark Sanford (R) will run for his old Charleston-based House seat, according to a report from the Weekly Standard.

Sanford has been expected to run for weeks, and a source close to him told The Hill earlier this week that he'd planned to announce his decision this week before saying he'd decided to hold off until early next week for an official announcement. The Weekly Standard report outlines a similar timeline.

Sanford, once a rising star in the GOP, saw his career unravel when he admitted to an affair with an Argentine woman in 2009 after initially claiming he was off hiking the Appalachian Trail.

He enters the race as an unlikely front-runner in a still-forming field to fill the former House seat of Sen. Tim Scott (R-S.C.). Most South Carolina GOP experts expect him to make the primary runoff, though who he faces in that the two-week runoff election will likely determine how good his chances are for a political resurrection.