President-elect Donald Trump is filling key posts in his second administration, putting an emphasis so far on people who were his strongest backers during the 2024 campaign. Among his picks are Robert F. Kennedy Jr. to lead the Department of Health and Human Services, Florida Sen. Marco Rubio for secretary of state, Florida Rep. Matt Gaetz for attorney general and Fox News Channel host Pete Hegseth as defense secretary. On Tuesday, he announced professional wrestling mogul Linda McMahon for education secretary, Wall Street executive Howard Lutnick for commerce secretary and TV doctor Mehmet Oz as his choice to oversee the Medicaid and Medicare programs.