The United States government has experienced repeated political crises since 2011, caused by the Republican Party’s legislative strategy of threatening to refuse to increase the statutory limit on gross public borrowing, also known as the debt ceiling. This thesis considers what the president must do if Congress passes spending and taxing laws that can only be carried out with additional federal borrowing, and when Congress then fails to increase the debt ceiling to accommodate that needed borrowing. The standard view in U.S. political circles is that the president would have to refuse to pay some of the parties to whom money is owed, that is, to cancel spending. That view is incorrect, because the U.S. Constitution requires the president t...