New US Federal Reserve chair Kevin Warsh vowed to be "reform-oriented" as he was sworn in at the White House on Friday, with President Donald Trump insisting the central bank chief would be "totally independent." It is unusual for the chief of the Fed -- an independent non-partisan body that sets monetary policy according to a dual mandate on inflation and employment -- to be sworn in at the White House.

Never before has a chair of the US Federal Reserve been so controversial. Who is Kevin Warsh? Can he preserve the Fed's independence, or will he become Donald Trump's puppet?

Never before has a chair of the US Federal Reserve been so controversial. Who is Kevin Warsh? Can he preserve the Fed's independence, or will he become Donald Trump's puppet?