Correction: This story has been updated to explain that Burr opposes some policy riders in the Senate user fee bill. Sen. Richard Burr, the GOP point-person on FDA user fee negotiations, said Tuesday (Sept. 20) he wants to place many user fee policy riders in the omnibus appropriations bill that Congress is expected to take up during the lame duck session. However, those following the negotiations said it would be difficult to pass those riders once must-pass...