Retired U.S. Army Lt. General Benjamin Mixon has criticized the repeal of “Don't Ask, Don't Tell” as moving “too fast.”

Last year, Congress approved and President Barack Obama signed into law a bill that ends the policy that bans gay and bisexual troops from serving openly, known as “Don't Ask, Don't Tell.” But the policy won't end until sixty days after top Pentagon leaders and the president certify that the military is ready for the change.

The military's four service chiefs testified before Congress this month that training for repeal of the policy was going well.

Mixon told The Washington Times on Monday that repeal was fraught with risk.

“There's no question in my mind that this is driven by politics and not military necessity,” he said. “Pushing this kind of social agenda in the military, especially during a time of war, is not appropriate. We're taking a great risk.”

“The risk is a breakdown in morale and unit cohesion,” Mixon, who retired on May 1, added.

Last March, as lawmakers debated whether to lift the policy, Mixon urged service members and their families to speak up in favor of the policy.

“Now is the time to write your elected officials and chain of command and express your views,” Mixon wrote in a letter published in Stars and Stripes, the U.S. military's independent news source. “If those of us who are in favor of retaining the current policy do not speak up, there is no chance to retain the current policy.”