The Senate Finance Committee kicks off its first hearing on prescription drug pricing Tuesday (Jan. 29), but Sen. John Cornyn (R-TX) already tweeted that a future topic of investigation will be abuses of the rebate system by pharmacy benefit managers -- an announcement that would typically be made by committee chairman Sen. Chuck Grassley (R-IA). Cornyn’s recent active role in drug pricing signals that he is seeking to be more involved in the issue as he prepares for a potentially...