BRYAN PRESTON: Now That S&P Has Downgraded U.S. Credit, Tim Geithner Should Resign. “Under Geithner’s watch, the United States has not had a national budget at all, and that includes two years when the party of his president controlled the White House and both houses of Congress. As Treasury Secretary, it was Geithner’s job to make the case that living without a national budget was reckless. The fact is, Geithner has offered no leadership at all. He should resign.”