The White House nomination of Ron Binz to chair the Federal Energy Regulatory Commission appears to be collapsing.

Binz has faced strong opposition from Republicans, and Democratic Sen. Joe Manchin (W.Va.) also opposes his nomination, endangering his path to confirmation.

On Thursday, a Democratic spokesman on the Senate Energy and Natural Resources Committee said other candidates are being considered for the post.

“The [Senate Energy and Natural Resources] Committee is aware that other candidates are being considered to lead FERC,” said Keith Chu, a spokesman for the committee’s Democratic leadership.