A yearlong investigation by the House Armed Services Committee has concluded that the Obama administration broke the law in swapping five Taliban members for Army Sgt. Bowe Bergdahl — and went out of its way to hide the negotiations as they were happening.

The report said the administration broke a law requiring it to give members of Congress 30 days’ advance notice of any detainee transfers from the Guantánamo Bay detention facility, where the senior Taliban leaders were held.

It also found that it misled reporters and lawmakers about a potential prisoner exchange. Congress was instead notified just hours before the May 2014 transfer took place.