Both chambers of Congress exercise much influence on the US foreign policy though its committees on foreign affairs, through checks on cabinet and other officials and through powers confered to them directly by the Constitution. For example , the Senate confirms all cabinet nominations, including that of the Secretary of State, as well as all ambassadorial appointments. This means that the Senate can block any officer from becoming an ambassador if it pleases so. The Senate also ratifies all treaties signed by the US with other nations or organizations. House committees may request executive branch officers or any government official to testify in an inquiry by a committee.
