The most outspoken critic of UN Ambassador Susan Rice is expected to join the Senate committee charged with vetting her credentials if she is nominated to head up the State Department. Arizona Sen. John McCain confirmed to Foreign Policy’s blog The Cable that he would be joining the Senate Foreign Relations Committee in January. … Though he has his concerns about Rice, McCain maintained the respect for the nominating system he has encouraged since 2005 when he responded to Democratic attempts to block the nomination of former UN Ambassador John Bolton. …