President Biden fired Social Security Commissioner Andrew Saul on Friday amid an ongoing dispute over his leadership of the independent agency responsible for administering retirement and disability benefits.

Saul was one of the few remaining federal appointees from former President Donald Trump’s administration. The White House said he was fired after refusing a request for his resignation. Deputy Social Security Commissioner David Black was also asked to resign and he complied.

President Joe Biden on Friday fired the commissioner of Social Security after the official refused to resign, and Biden accepted the deputy commissioner’s resignation, the White House said.

Biden asked commissioner Andrew Saul to resign, and his employment was terminated after he refused the Democratic president’s request, a White House official said.

Deputy Commissioner David Black agreed to resign, said the official, who spoke on condition of anonymity to discuss personnel matters.

Both officials had been put in place under President Donald Trump, a Republican.

President Biden on Friday fired Social Security Commissioner Andrew Saul, a holdover from the Trump administration who had alienated crucial Democratic constituencies with policies designed to clamp down benefits and an uncompromising anti-union stance.

Saul was fired after refusing a request to resign, White House officials said. His deputy, David Black, who was also appointed by former president Donald Trump, resigned Friday upon request.