The director of the agency overseeing legal entry into the United States, including through green cards and asylum, was asked to resign from the agency on Friday, according to a letter sent out to the agency and obtained by NBC News.

L. Francis Cissna has served as President Trump’s only director of U.S. Citizenship and Immigration Services, an agency within the Department of Homeland Security. He oversaw the agency during the final iteration of the travel ban, attempts to repeal status for “Dreamers” and the administration’s repeated attempts to limit the ability for undocumented immigrants crossing the southern border from Central America to claim asylum.

USCIS is now on the verge of finalizing a rule to restrict legal immigrants who use public benefits from receiving green cards, or legal permanent residency.