The tea party wing of the GOP gained a voice in President Donald Trump's Cabinet on Thursday when Mick Mulvaney was sworn in as director of the White House budget office.
Vice President Mike Pence administered the oath of office hours after the Senate confirmed the South Carolina Republican's nomination on a narrow 51-49 vote in the GOP-controlled Senate.
Pence praised Mulvaney's "extraordinary record" and said he "couldn't be more enthusiastic" about Trump's decision to choose him.
Not all Republicans shared Pence's sentiments.
Arizona Sen. John McCain, who is emerging as perhaps the most vocal GOP critic of the Trump administration,...