In a hearing, Democrats repeated earlier warnings that they are unlikely to approve pending trade pacts with Peru, Colombia and Panama unless the administration agrees to provisions tightening labor and environmental protections in those countries...The new chairman of the House Ways and Means Committee, Charles B. Rangel (D-N.Y.), presided over a wide-ranging discussion that touched on how to prevent companies from shifting production to exploitative factories in poor countries, how to confront China over allegedly unfair trade practices and how to help Americans who lose jobs. [also refers to Caterpillar, Wal-Mart]