A Columbia University student from Germany has sued the school, saying it failed to protect him against harassment after a female student went public with claims he raped her after the school and police rejected her case.

The lawsuit was filed Thursday in Manhattan federal court by Paul Nungesser. He says the student's campaign to muddy his name by dragging a mattress around campus and demonstrating has isolated him and hurt his job prospects and ability to stay in the U.S.

The lawsuit said the Ivy League school effectively sponsored his gender-based harassment and defamation, causing an intimidating and hostile learning and living environment.

He says the woman's publicity efforts led her to be invited to President Barack Obama's State of the Union Address.

A university spokesman declined comment.