Idaho Republican Sen. Larry Craig 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.

Craig, 62, will announce this morning that he will resign effective Sept. 30, four state GOP officials said, speaking on condition of anonymity.

The announcement follows by just five days the disclosure that he had pleaded guilty Aug. 1 to a reduced misdemeanor charge arising out of his arrest June 11 at the Minneapolis airport.

Craig had maintained he did nothing wrong except make the guilty plea without consulting a lawyer. But he found almost no support among Republicans in Idaho or Washington.

Idaho Gov. C.L. ''Butch'' Otter appears to have already settled on a successor: Lt. Gov. Jim Risch, according to several Republicans.