In Georgia Senate race, Herschel Walker navigates allegations of past violent behavior

Walker’s run has renewed scrutiny of battle with complex mental health condition.

An athletic icon and business success, Herschel Walker has the type of background that Republicans hope will propel him to the U.S. Senate, where his presence could very well tip the balance of power in the deeply divided chamber.

But Walker’s political ambitions have also revived scrutiny of another side of his record: allegations of domestic violence, physical threats and stalking. Walker has denied some of those accusations. Others he claims not to remember – a byproduct of his diagnosis with dissociative identity disorder, or D.I.D., a complex mental health condition characterized by some severe and potentially debilitating symptoms.

Recruited and endorsed by former President Donald Trump, his longtime friend and mentor, Walker is expected to win next week’s Republican primary by a substantial margin. Some Republicans fear, however, that if Walker earns the GOP nomination, these claims could catch up with him come November – when he would likely face formidable Democratic incumbent Sen. Raphael Warnock – particularly if he fails to adequately answer for them now.

“[Walker] will have a better shot to win the general [election] if he addresses those issues that are out there from his past,” Georgia’s Republican Lt. Gov. Geoff Duncan, who has not endorsed any candidate in the primary, told ABC News’ “Nightline.” “If he doesn't, then I think it's going to be a tough day in Georgia when we get to the November election, and we're going to send, unfortunately, another Democrat to represent us as a U.S. senator.”