That what CNN says the Associated Press is reporting. Here's the word from AP via IdahoStatesman.com:
Idaho Republican Sen. Larry Craig will announce Saturday he will resign from the Senate amid a furor over his arrest and guilty plea in a police sex sting in an airport men’s room, Republican officials said Friday.6:57 PM The article above has been UPDATED with these lines:
Craig's communications director Dan Whiting told the Idaho Statesman, "I won't say either way."
The Idaho Statesman independently confirmed the report.
Craig's office declined to confirm or deny a resignation.