"It's difficult to justify the sanctions as necessary to protect the amateur nature of college sports, preserve competitive balance or maintain academic integrity," he said.
Joseph Bauer, an antitrust expert at the University of Notre Dame law school, said of Corbett's line of reasoning: "I don't think it's an easy claim for them to make, but it's certainly a viable claim."
Sandusky, 68, was convicted in June of sexually abusing 10 boys, some of them on Penn State's campus. He is serving a 30- to 60-year prison sentence but insists he's innocent.
Michael Boni, a lawyer for one of Sandusky's accusers, said he does not consider the lawsuit an affront. But he said he hopes Corbett takes a leading role in pushing for changes to state child-abuse laws.
"I really question who he's concerned about in this state," Boni said.
Michael Desmond, a businessman who appeared with Corbett at the news conference, said business at his five State College eating establishments was down about 10 percent during Penn State home game weekends this year.
"The governor's actions are going to be immensely popular with all Penn State alumni," Desmond said.
Corbett, a Republican, said his office did not coordinate its legal strategy with state Attorney General-elect Kathleen Kane, who is scheduled to be sworn in Jan. 15. Instead, the current attorney general, Linda Kelly, granted the governor authority to pursue the matter.
Kane, a Democrat, ran on a vow to investigate why it took prosecutors nearly three years to charge Sandusky. Corbett was attorney general when his office took over the case in 2009.
Kane had no comment on the lawsuit because she was not consulted about it by Corbett's office.
State and congressional lawmakers have objected to use of the NCAA fine to finance child-abuse prevention efforts in other states. Penn State has already made the first $12 million payment, and an NCAA task force is deciding how it should be spent.
Associated Press writers Peter Jackson in Harrisburg and Michael Rubinkam contributed.
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