In a letter, Rep. Jason Chaffetz urges Attorney General Eric Holder to investigate a video in which Stephen Lerner, a former SEIU official, allegedly discusses "a plan to collapse the American economy -- including crashing the stock market -- so that unions can become more powerful."

The sinister plan is set to take place in May and includes mass homeowner mortgage strikes.

Chaffetz tells Holder "the escalation of Mr. Lerner's threats would clearly constitute domestic terrorism and pose substantial harm to the American people and the economy." He goes on to request Holder investigate "Mr. Lerner's terrorist plans and notify me how the Department of Justice plans to respond to these threats."

The letter, sent Wednesday, was also distributed to Rep. Darrell Issa (R-CA), chairman of the House committee on Oversight & Government Reform, and Rep. Elijah Cummings (D-MD), the ranking minority member.