The Obama administration has defended trading five Taliban Guantanamo Bay detainees for Sgt. Bowe Bergdahl citing the "no man left behind" policy as a reason. 

But Sgt. Matt Vierkant (Ret.), one of Bergdahl's former platoon leaders, told Bill Hemmer today on "America's Newsroom" that Bergdahl was not a good reason for the policy to be enforced.  

"It's a good overall policy, but in this case, he essentially took himself off the battlefield and became an enemy combatant when he became a deserter and decided to join the enemy," Vierkant said. "There's a huge difference between being captured and leaving to join the enemy."

Man Who Led Search for Bergdahl: 'Soldiers Died Looking For Him'

Megyn Kelly Grills Jen Psaki: 'Was Bergdahl Swap Worth It?'

O'Reilly: Bergdahl's Desertion Charge 'An Acute Embarrassment for Obama'

Judge Nap: Death Penalty for Bergdahl Seems to Be Off the Table

Vierkant said that he doesn't think the statements were true when the administration said that Bergdahl's health was declining and that's why it was necessary to immediately rescue him.

"When you see him after they picked him up, and then pictures when he came back and after his evaluations back here in the United States, they said that he was in good health and he was healthy," Vierkant said. "He looked healthy. He looked like he was in good shape. I don't think those [previous] statements were true."

Hemmer reminded Vierkant of National Security Advisor Susan Rice's past comments defending the prisoner swap saying Bergdahl “served the United States with honor and distinction” and asked how he thought Bergdahl served the nation. 

"He's a disgrace to this nation, the uniform, his rank of Sergeant that they gave him," Vierkant stated. "Pretty much there is no honor in his service, especially when you leave your battle buddies and brothers in arms behind and join the enemy. I don't see how there's any honor in that."

Vierkant shared that he was one of the people who went out searching for Bergdahl in Afghanistan when he was initially missing. He remarked that Bergdahl should "sit in prison for 20 years to life."

Watch the full interview above.