Donald Trump has picked Kevin Warsh to lead the US Federal Reserve when current chairman Jerome Powell’s four-year term ends in May.

Warsh is a former Fed governor and was considered for chair during Trump’s first term. He has been an outspoken Fed critic and is expected to support lower interest rates in the near term.

The appointment comes amid mounting worries about the Fed’s independence, following Trump’s increasing attacks on Powell in recent months.

Powell has angered Trump by not cutting interest rates quickly enough, and federal prosecutors recently opened a criminal investigation over testimony he gave to the Senate about renovations to Fed buildings.