Each of the following is an example of the Executive Branch as a source of law EXCEPT for which one?

President Truman's decision to seize the nation's steel mills to prevent a strike

President Johnson's decision to require government contractors to set out an affirmative action plan for the hiring and promotion of minorities and women

President Carter's decision to enter into a treaty with the nation of Panama

President Clinton's decision not to support a bill introduced by Congressman Archer replacing the federal income tax with a national sales tax