U.S. Sen. Wayne Allard of Colorado said he doesn't believe that his Republican colleague who was arrested in a men's restroom is gay.

Allard, who served in the Senate since 1997, said he was "flabbergasted" to learn about the arrest of U.S. Sen. Larry Craig, a three-term senator. A plainclothes officer was investigating complaints about sexual activity in the bathroom.

Allard said he's never heard anyone discuss Craig's sexuality.

"Never. Nada. Not one rumor of impropriety," he said.

The two have worked together on a number of Western issues.

"I'm flabbergasted," Allard said. "I don't believe he's gay."

Asked if it mattered if Craig were gay, Allard reiterated that he doesn't believe his colleague is gay.

Craig on Tuesday said, "I'm not gay. I've never been gay."