The president of Yeshiva University in New York has said the college will not allow immigration officials to enter campuses without a warrant and will not disclose information about students without a court-ordered subpoena.

In doing so, Richard Joel was aligning the university with “sanctuary campuses” — meaning it will not cooperate with immigration authorities trying to track down undocumented students attending the college. California State University and Iowa State University have also adopted similar policies.

What began as a petition signed by 200 students, faculty members, and staff, led to a letter from Joel laying down the university’s policies.

“We are committed to protecting the privacy of our students, staff and faculty to the fullest extent allowed by law,” Joel wrote in the missive. “Our policy is not to disclose any private information about our students, faculty, or staff, unless we are presented with a subpoena or court order.

“Further to this point, we will not act on behalf of the federal agents and not assist in any efforts to investigate or detain students, staff, or faculty unless presented with a warrant or other legal process,” Joel continued.

The so-called sanctuary campus movement gained momentum in the later stages of the US presidential election after then-Republican nominee Donald Trump declared he would enact mass deportations of illegal immigrants if elected. Trump, who won the election and took office last week, has since signed an executive order banning for 90 days the entry of citizens from seven predominantly Muslim countries: Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen. The ban also prevents refugees from from entering the US for 120 days.