what principle of the constitution allows congress to override a presidential veto
Veto If the Congress overrides the veto by a two-thirds vote in each house, it becomes law without the President's signature. Otherwise, the bill fails to become law unless it is presented to the President again and the President chooses to sign it.[12] Historically, the Congress overrides the Presidential veto 7% of the time.[13]
Flag Desecration Amendment The most recent attempt to adopt a flag desecration amendment failed in the United States Senate by one vote on June 27, 2006.[1][2]
Postal Clause Article I, Section 8, Clause 7 of the United States Constitution, known as the Postal Clause or the Postal Power, empowers Congress "To establish Post Offices and post Roads".[1]
Presentment Clause The Presentment Clause, which is contained in Article I, Section 7, Clauses 2 and 3, provides: