The finding, contained in a March memo that was described to The Washington Post, said Secretary of State Marco Rubio did not have sufficient grounds for revoking Ozturk’s visa under an authority empowering the top U.S. diplomat to safeguard the foreign policy interests of the United States.

The memo, written by an office within the State Department, raises doubts about the public accusations made by the Trump administration as it has sought to justify Ozturk’s deportation. The Department of Homeland Security has said Ozturk engaged in activities “in support of Hamas,” a U.S.-designated terrorist organization, but neither that agency nor U.S. prosecutors have provided evidence for that claim.