Former Wisconsin congressman Sean Duffy was sworn in as new U.S. Transportation Secretary this week. Here's what his responsibilities include.

Duffy has quickly emerged as the public face of the federal government’s response to the deadly plane crash at Washington’s Reagan National Airport.

Mr. Duffy, a former congressman who had appeared on track to sail through with little opposition, overcame a last-minute swell of Democratic anger over the White House’s sweeping funding freeze.