Retired Navy Lt. Commander Montel Williams appeared at a House hearing Wednesday on the six-month detention of a U.S. Marine in Mexico.

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"I have no idea," he said when asked by Bill Hemmer why President Obama has not made a phone call to the Mexican president on behalf of Sgt. Andrew Tahmooressi.

Tahmooressi has now been diagnosed with PTSD by a prosecution psychiatrist, raising hopes that the judge will agree to release him so he can receive treatment in the U.S.

"I did 22 years in the military. I went through Paris Island. I'm a Marine. I will never not be one. We leave no man behind, period. The fact that this country is willing to do so, at the same time that we're out on all of our campaign fundraising, talking about how we supported going to war to send more boys off to die. We won't even protect the ones that have served for us," said Williams, calling it "disgusting" that more outlets are not covering the case heavily.

Williams lamented the fact that the hearing was largely overshadowed by the Secret Service's problems.

He called out President Obama for the Bowe Bergdahl prisoner swap, pointing out that the president justified the much-criticized trade by saying Bergdahl's health was in serious jeopardy.

Williams said maybe the president isn't getting personally involved in this case because it's too politicized, especially after the border crisis over the summer. But he said "compassion" is reason enough for the president to demand Tahmooressi's release.

Choking back tears, Williams said when sick people come across the border illegally, they get treatment in the United States even though they broke the law.

"Every child that's come across that border. Every person that has made their way into this country illegally, we catch you, we put you in prison. We find out you have tuberculosis, we treat you. We find out you have cancer, we treat you, at our expense! This is an ally! A Marine, a U.S. citizen is in your prison. Treat him with the same respect that we treat your people who are in our country," said Williams.

He said he's not sure if yesterday's hearing helped Tahmooressi's cause, noting that only 81 lawmakers have signed onto House Resolution 620, which calls for the immediate release of the Marine sergeant.

Watch the full segment above.

Jailed Marine's Release Looking 'Increasingly Likely'

Earnest to Henry: ‘I Don’t Believe’ Obama Has Called Mexico About Marine