The Climate Change Scientific Program was occasionally criticized for the alleged suppression of scientific information. In March 2005, Rick S. Piltz resigned from CCSP charging political interference with scientific reports: "I believe ...that the administration … has acted to impede forthright communication of the state of climate science and its implications for society." Piltz charged that the Bush Administration had suppressed the previous National Assessment on Climate Change, by systematically deleting references to the report from government scientific documents. Piltz later complained about political tinkering with the timing of SAP 4.6, and suppression of sea level rise mapping studies associated with SAP 4.1.