By Vicki Needham - 04/29/10 07:15 PM EDT
The interview got heated when CNBC's Mark Haines questioned how financial firms contributed to job losses and questioned the role of unions and automakers.
Automakers didn't bring the economy to "the brink of disaster," Trumka responded. "These guys took $13 trillion worth of assets away from average Americans and they haven't learned a lesson."
About 25,000 union members are expected in New York today -- 10,000 in New York and about 15,000 virtual marchers, the AFL-CIO said.