As the North Vietnamese chipped away more and more at South Vietnam, internal opposition to President Thiệu continued to accumulate. For instance, in early April, the Senate unanimously voted through a call for new leadership, and some top military commanders were pressing for a coup. In response to this pressure, Thiệu made some changes to his cabinet, and Prime Minister Trần Thiện Khiêm resigned. This did little to reduce the opposition to Thiệu. On April 8, a South Vietnamese pilot and communist, Nguyễn Thành Trung, bombed the Independence Palace and then flew to a PAVN-controlled airstrip; Thiệu was not hurt.