State Attorney General Andrew Cuomo denounced Hiram Monserrate’s last-ditch legal bid to keep his Senate seat as “dangerous” and “absurd,” in papers filed yesterday in Manhattan federal court.

Cuomo, who’s defending the Senate’s historic vote last week to expel the convicted Queens Democrat, argued that lawmakers had every right to protect the institution.

If Monserrate’s case were upheld, Cuomo contended, the Senate “could not expel a member who is demonstrably corrupt, insane or violent.”

The Senate voted, 53-8, to boot Monserrate Feb. 2 as punishment for his conviction last fall on a misdemeanor domestic-violence charge. The former city cop was acquitted of more serious charges stemming from a 2008 incident in his apartment that left his girlfriend, Karl Giraldo, with a slashed face.