Stephen Miran, President Donald Trump’s nominee to temporarily be a Federal Reserve governor, vowed to maintain the central bank’s independence during his confirmation hearing on Thursday, as Democrats raised the fear that he would aid a Trump takeover of the Fed.

Miran, who is currently chairman of the White House Council of Economic Advisers, faced questions about how he would approach the role and the Fed’s independence more broadly during his confirmation hearing before the Senate Banking Committee. Miran was nominated to replace Adriana Kugler, who unexpectedly resigned last month.