The president is expected to sign an executive order Saturday that will direct his Commerce Department and the U.S. Trade Representative to perform a comprehensive study of the nation's trade agreements to determine whether America is being treated fairly by its trading partners and the 164-nation World Trade Organization. In addition to the visit to the Ames tool factory, which has been manufacturing shovels since 1774, the president will hold one of his signature campaign rallies in Harrisburg to cap the occasion. The more significant of the two orders will give the Commerce Department and the U.S.