WASHINGTON — Some Republicans are blaming an outside group supporting President Donald Trump for the unexpected delay Tuesday of a vote on a Senate health care proposal.

America First Policies spent four days on a pull-no-punches campaign against Republican Sen. Dean Heller of Nevada, beginning shortly after he surprised members of his own party with a Friday afternoon press conference denouncing the Senate plan as written.

America First is a politically active nonprofit run by a former White House aide and Trump campaign veterans.