(CNN) The woman accusing Supreme Court nominee Brett Kavanaugh of sexual assault says the FBI should investigate the incident before senators hold a hearing on the allegations.

In a letter addressed to Senate Judiciary Chairman Chuck Grassley of Iowa, and obtained by CNN's "Anderson Cooper 360," Christine Blasey Ford's attorneys argue that "a full investigation by law enforcement officials will ensure that the crucial facts and witnesses in this matter are assessed in a non-partisan manner, and that the Committee is fully informed before conducting any hearing or making any decisions."