It has been asserted that the president's responsibility in the "faithful" execution of the laws entitles him to suspend the privilege of the writ of "habeas corpus". Article One provides that the privilege may not be suspended save during times of rebellion or invasion, but it does not specify who may suspend the privilege. The Supreme Court ruled that Congress may suspend the privilege if it deems it necessary. During the American Civil War, President Abraham Lincoln suspended the privilege, but, owing to the vehement opposition he faced, obtained congressional authorization for the same. Since then, the privilege of the writ has only been suspended upon the express authorization of Congress, except in the case of Mary Surratt, whose writ was suspended by President Andrew Johnson regarding her alleged involvement in the assassination of President Lincoln.