President Donald Trump on Thursday withdrew the nomination of Dr. Casey Means for surgeon general and announced Dr. Nicole B. Saphier as his new pick for the position.

Trump announced the change in a post on Truth Social, stating that Means would continue working with the "Make America Healthy Again" movement led by Health Secretary Robert F. Kennedy Jr. The president blamed Republican Senator Bill Cassidy of Louisiana for the nomination's stalling in the Senate, accusing him of playing "political games."

Dr. Means' nomination had faced obstacles in part due to her views on vaccines, according to reports. Her confirmation process had stalled amid opposition from members of the Senate.

Dr. Saphier is a radiologist at Memorial Sloan Kettering Cancer Center and a contributor to Fox News. She now becomes Trump's nominee to serve as the nation's top public health spokesperson and advisor.

The surgeon general position requires Senate confirmation. The role involves leading the U.S. Public Health Service Commissioned Corps and advising the public on health matters.