Following Chancellorsville and the death of Stonewall Jackson, Longstreet and Lee met in mid-May to discuss options for the army's summer campaign. Longstreet once more pushed for the detachment of all or part of his corps to be sent to Tennessee. The justification for this course of action was becoming more urgent as Union Maj. Gen. Ulysses S. Grant was advancing on the critical Confederate stronghold on the Mississippi River, Vicksburg. Longstreet argued that a reinforced army under Bragg could defeat Rosecrans and drive toward the Ohio River, which would compel Grant to break his hold on Vicksburg. He advanced these views during a meeting with Confederate Secretary of War James Seddon, who approved of the idea but doubted that Lee would do so, and opined that Davis would be unlikely to go against Lee's wishes. Longstreet had criticized Bragg's generalship and may have been hoping to replace him, although he also might have wished to see Joseph Johnston take command, and indicated that he would be content to serve under him as a corps commander. Lee prevented this plan from taking place by telling Davis that parting with large numbers of troops would force him to move his army closer to Richmond, and instead advancing a plan to invade Pennsylvania. A campaign in the North would relieve agricultural and military pressure that the war was placing on Virginia and North Carolina, and, by threatening a federal city, disrupt Union offensives elsewhere and erode support for the war among Northern civilians. In his memoirs, Longstreet described his reaction to Lee's proposal: