By April 8, the North Vietnamese Politburo, which in March had recommended caution to Dũng, cabled him to demand "unremitting vigor in the attack all the way to the heart of Saigon." On April 14, they renamed the campaign the "Hồ Chí Minh campaign", after revolutionary leader Hồ Chí Minh, in hopes of wrapping it up before his birthday on May 19. Meanwhile, South Vietnam failed to garner any significant increase in military aid from the United States, snuffing out President Nguyễn Văn Thiệu’s hopes for renewed American support.