The U.S. Department of Justice has subpoenaed several journalists from The New York Times to testify before a federal grand jury regarding their reporting on security issues tied to President Donald Trump’s new Air Force One, which was donated by Qatar. According to the media organization, the subpoenas were issued on Friday by Jay Clayton, the U.S. Attorney for the Southern District of New York, and in some cases were personally delivered to reporters’ homes by federal agents. Those subpoenaed are expected to appear before the grand jury on Wednesday to address an alleged violation of federal criminal law.

The New York Times characterized the subpoenas as a significant escalation in what it described as President Trump’s efforts to intimidate independent news outlets. The DOJ declined to confirm or deny the existence of the subpoenas but emphasized that the administration’s primary concern is the unauthorized disclosure of classified information, not the targeting of reporters. The White House has not provided an immediate response to requests for comment.

The underlying reporting that prompted this legal action focused on security concerns related to the new Air Force One aircraft. Earlier this week, President Trump traveled on a mission that included a stopover at the Royal Air Force base at Mildenhall, Britain. Trump said he chose to use an older Air Force One plane “for old time’s sake” for the flight from Ankara, Turkey, to the British base, as the new aircraft—donated by Qatar—also landed there to allow U.S. service members stationed at the base the opportunity to tour the new plane. Video footage released late Wednesday showed Trump boarding the new Air Force One at Mildenhall as it prepared to return to the United States.

This case has drawn attention to the balance between press freedom and national security concerns, highlighting ongoing tensions around the reporting of sensitive information related to the president’s official travel and aircraft security. The investigation is ongoing, and the legal proceedings will likely raise further debate about the government’s use of grand jury subpoenas in cases involving the press.