HARRISBURG, Pa.—Penn State's lawyers are asking a judge to throw out a whistleblower and defamation lawsuit filed by a former football assistant who's testified he saw Jerry Sandusky attack a boy in a school shower more than a decade ago.

The university made a court filing Tuesday that says Mike McQueary's lawsuit is too vague and doesn't meet legal standards to support claims of defamation and misrepresentation.

The school's lawyers say it's not enough for McQueary to have been embarrassed or annoyed in order for defamation to be valid. The filing says he also has to have suffered harm that "has grievously fractured his standing in respectable community."

McQueary is suing the university for millions of dollars, saying former president Graham Spanier made him a scapegoat after Sandusky's arrest.