The U.S. military has announced a probe of the circumstances surrounding Army Sergeant Bowe Bergdahl’s disappearance in Afghanistan that led to his five-year capture. Bergdahl was freed over the weekend in a prisoner swap with the Taliban. Despite winning the freedom of the lone known U.S. prisoner of war, the deal has come under Republican attack amidst reports Bergdahl voluntarily left his base after growing opposed to the war in Afghanistan. The White House has apologized to key lawmakers for failing to notifying them of the prisoner swap in advance. Senator Dianne Feinstein said she received a call Monday night.

Sen. Dianne Feinstein: “I did have a call last night from the White House, and they apologized — he apologized.”

Reporter: “Are they acknowledging that the law was broken in that apology?”

Sen. Dianne Feinstein: “No, I didn’t ask for that. I mean, it was — it’s obvious.”

The Taliban, meanwhile, has released a video reportedly showing Bergdahl’s handover to U.S. Special Operations Forces on Saturday.