President-elect Donald Trump's threat Monday to "knock out" pharmacy benefit managers to hold down prescription drug prices helped send CVS Health, Cigna, and UnitedHealth Group to another session of sharp losses for the managed care group.

Shares of pharmacy benefit managers fell Monday after President-elect Donald Trump said he plans to “knock out” drug industry middlemen, a sign the sector isn’t likely to see relief from political scrutiny during his administration.

While Robert F. Kennedy Jr. has promised to take on Big Pharma, his boss seems to be focused on drug middlemen instead. Twice in the past month, Donald Trump has singled out companies known as pharmacy benefit managers (PBMs),