WEEKEND UPDATE

Today on the Mark Larson Weekend Show: Robert Spencer, Islam expert and author of "The Truth About Muhammad". Also: Former Nixon "hatchet man" (so his critics said) Charles Colson. 4 to 5PM Pacific on Newsradio 600 KOGO and www.kogo.com

TOMORROW: Monday's guests include Governor Arnold Schwarzenegger and Vince Flynn, author of the new thriller, "Act of Treason" 12-3PM Pacific on KOGO.