The Trump administration said that had the new prices been in effect last year, Medicare would have saved $12 billion, which would have reduced its spending on those drugs by 44 percent.
Before casting a crucial vote for the health secretary, the top Senate Republican laid out several specific commitments he had secured, some of which appear to have been breached.
In an interview, Health Secretary Robert F. Kennedy Jr. cited gaps in vaccine safety research. His critics say he is ignoring a larger point: Vaccines save lives.
It is highly unusual for a health secretary to personally order a change to scientific guidance, but Robert F. Kennedy Jr. ordered the language adjustment on the C.D.C. website.
The weight loss medicines are proving to be a test case for Robert F. Kennedy Jr., the health secretary, in straddling divisions between his supporters and the president.
Robert F. Kennedy Jr., the health secretary, appearing in the Oval Office on Nov. 6 with other health officials, the chief executives of Novo Nordisk and Eli Lilly and others.
The official, Dr. George Tidmarsh, has become embroiled in an ethical dispute and is now the target of a lawsuit over his actions involving certain drugs tied to a business associate.
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