MEXICO CITY (AP) - Mexico warned Thursday that the U.S. proposal to build miles of border fence will damage relations between the two countries. The Foreign Relations Department said it was "deeply worried" about the proposal, which is working its way through the Senate, adding it will "increase tension in border communities." "These measures will harm the bilateral relationship. They are against the spirit of co-operation that is needed to guarantee security on the common border," the department said in a statement. The House of Representatives and Senate are maneuvering to speed construction of a 700-mile fence along the United...