The head of U.S. Immigration and Customs Enforcement, Jonathan Fahey, resigned Wednesday after less than two weeks on the job, the Washington Examiner has learned.

Fahey, a former criminal prosecutor, resigned abruptly in what one person familiar with the situation said was due to his being pressured to sign an agreement with ICE’s union. ICE confirmed Fahey’s resignation late Wednesday night. He was the seventh person to lead ICE under the Trump administration.