Combative, Defensive and Occasionally Contrite, Kennedy Walks a Fine Line

In four days of congressional testimony, the health secretary sought to please the White House and his MAHA base at the same time.Health Secretary Robert F. Kennedy Jr. congressional appearances came at a time of great flux for his department, including the nomination of Dr. Erica Schwartz, whose supportive views on vaccines diverge sharply from Mr. Kennedy’s, to lead the Centers for Disease Control and Prevention.