The chairman of the Republican Party of Florida is calling for Representative Trey Radel to step down after his recent cocaine conviction. The chairman, Lenny Curry, released a statement on Monday saying that Mr. Radel should resign and devote his time to rehabilitation and his family. Mr. Radel pleaded guilty to cocaine possession last week after attempting to buy $250 worth of cocaine from an undercover police officer in Washington in October. Mr. Radel took a leave of absence and checked himself into a rehabilitation facility. His spokeswoman did not return a phone call seeking comment.