Boxer voted against John Bolton's nomination for U.S. Ambassador to the United Nations in the Senate Foreign Relations Committee and filibustered him on the Senate floor. Because of the strong Democratic opposition, Bolton could not obtain Senate approval. However, President Bush bypassed the Senate by employing the constitutional right of recess appointment, only the second time such an appointment has been used for a United States ambassador to the United Nations since the UN's founding in 1945. Recess appointments themselves have been used numerous times by various presidents.