MADISON, Wis. -

Three congressional Democrats sent Gov. Scott Walker a letter asking him about testimony that he made under oath last year in light of a video that shows Walker talking about using a "divide and conquer" strategy.

Walker answered "no" when asked during the April 2011 House committee hearing if he had a conversation about his proposal effectively ending collective bargaining for most public workers being used to punish members of the opposition party and their donors.

The Democrats asked Walker in the letter to confirm his participation in the conversation caught on the video where he told a Beloit billionaire he planned to use a "divide and conquer" strategy against the unions.

Walker spokesman Chris Schrimpf didn't say in a statement whether the governor would respond to the request.