The association representing the nation’s leading research universities said Friday that it planned to develop and administer a sexual assault climate survey for its members, in part to fend off efforts in Congress to mandate such surveys. The Association of American Universities said that it had hired a research firm to design a survey that its 60 U.S. member institutions may choose to have conducted on their campuses next April. The group plans to then publicly report the “cumulative results” from those surveys.