An Indiana state senator whose affair with a 23-year-old intern prompted a call for his resignation has apologized for his conduct. But he won't quit.

"I have no intention of resigning," Sen. Steven R. Johnson told television station WTHR on Tuesday. "I still think I have a great deal to offer and I'm committing myself to being a great legislator."Johnson, a Republican who is the ranking member of the Senate Ethics Committee, issued a statement Friday admitting he had a "brief relationship" with another woman.

His wife, Shannon Johnson, said the relationship occurred during the 1997 legislative session with a Senate intern. Johnson, 50, said he told his wife of the affair and they received counseling.