HARRISBURG — Saying he’s “tired of explaining the inexplicable,” Chuck Ardo, the spokesman for Pennsylvania Attorney General Kathleen Kane, said Friday that he is quitting.

Like Kane’s seven previous press secretaries, Ardo is leaving his job, widely thought to be one of the toughest in state government.

In an interview, Ardo said he told Kane late this week that he wanted to end his contract with the Attorney General’s Office to act as her top press aide. He said he was simply exhausted at having to defend his boss.

He said the turning point came earlier this month, when Kane loudly objected as he was giving a reporter a tour of the executive offices.

“I have a philosophy, I try to be open, transparent and honest, and that seems to rub some people the wrong way,” said Ardo, whose previous bosses have included former Pennsylvania Gov. Ed Rendell.

“I just don’t have any gas left in the tank to do this job,” he said. “It’s by far and away the most difficult job I’ve ever had.”

Kane could not be reached for comment.

Her top deputy, Bruce Castor, called Kane “a good boss.”

“I have nothing negative to say about her management style,” said Castor, whom Kane hired in March as the solicitor general to help with executive decisions — and to serve as an ally in an office where many top aides have been witnesses against her in grand jury investigations.

Kane was charged last summer with perjury, conspiracy and other crimes for allegedly leaking confidential grand jury information to a newspaper in a bid to embarrass a foe. She has admitted leaking the material, but said she did so in a lawful way.