Stephen Colbert has one question for Donald Trump: 'What does Vladimir Putin's d*ck taste like?'

An audience member asked Stephen Colbert during a pre-show question-and-answer session what he would ask Donald Trump -- and his answer was unfit for broadcast.

"My question is, if you had Donald Trump on your show tonight, what would you ask him?" the woman asked Wednesday, hours after the Republican presidential nominee encouraged Russia to hack into Hillary Clinton's emails.

Russia has been blamed by U.S. authorities for hacking into the Democratic National Committee's private emails in an apparent attempt to help Trump win the election, raising new questions about the GOP nominee's ties to Vladimir Putin and wealthy Russian investors.

Colbert thought about the woman’s question for a moment, apparently trying to decide whether to say his answer out loud.

"We're not broadcasting right now, so I'd say, 'What does Vladimir Putin's dick taste like?'" Colbert asked.

The audience broke into sustained applause and laughter, and Colbert's band broke into a song.

"That's a fine joke," Colbert chuckled. "Don't tell your grandkids that joke."