The U.S. State Department announced on Saturday night that it will be revoking all visas held by South Sudanese passport holders after the East African country refused to cooperate with U.S. deportation efforts.

In a brief statement, Secretary of State Marco Rubio said since South Sudan has not accepted the return of its citizens from the United States in a “timely manner,” the State Department “is taking actions to revoke all visas held by South Sudanese passport holders and prevent further issuance to prevent entry into the United States by South Sudanese passport holders,” effective immediately.