Senate Majority Leader Mitch McConnell and Scott Pruitt, Oklahoma's attorney general and President-elect Donald Trump's nominee to head the EPA, earlier this month.
Mark Wilson/Getty Images
Rex Tillerson, chief executive officer of Exxon Mobile Corp., left, listens on the opening day of the St. Petersburg International Economic Forum this past June.
Bloomberg/Bloomberg via Getty Images
Newly appointed Secretary of State for exiting the European Union David Davis arrives at 10 Downing Street. He and five other Cabinet members were announced Wednesday by Prime Minister Theresa May.
Chris J Ratcliffe/Getty Images
Health and Human Services Secretary Kathleen Sebelius speaks as Attorney General Eric Holder listens during a news conference last October. The two plan to remain in their current jobs as President Obama's second term begins.
Alex Wong/Getty Images