<P> Congress has authority over financial and budgetary matters, through the enumerated power to lay and collect taxes, duties, imposts and excises, to pay the debts and provide for the common defense and general welfare of the United States . The Sixteenth Amendment, ratified in 1913, extended power of taxation to include income taxes . The Constitution also grants Congress exclusively the power to appropriate funds . This power of the purse is one of Congress' primary checks on the executive branch . Other powers granted to Congress include the authority to borrow money on the credit of the United States, regulate commerce with foreign nations and among the states, and coin money . Generally both Senate and House have equal legislative authority although only the House may originate revenue bills and, by tradition, appropriation bills . </P> <P> The Constitution also gives Congress an important role in national defense, including the exclusive power to declare war, to raise and maintain the armed forces, and to make rules for the military . Some critics charge that the executive branch has usurped Congress's Constitutionally - defined task of declaring war . While historically presidents initiated the process for going to war, they asked for and received formal war declarations from Congress for the War of 1812, the Mexican--American War, the Spanish--American War, World War I, and World War II, although President Theodore Roosevelt's military move into Panama in 1903 did not get Congressional assent . Presidents have initiated war without Congressional war declarations; Truman called the Korean War a "police action" and the Vietnam War lasted over a decade without a declaration of war . In 1970, Time magazine noted: "All told, it has been calculated, U.S. presidents have ordered troops into position or action without a formal congressional declaration a total of 149 times" before 1970 . In 1993, one writer noted "Congress's war power has become the most flagrantly disregarded provision in the Constitution," and that the "real erosion (of Congressional authority to declare war) began after World War II ." President George H.W. Bush claimed he could begin Operation Desert Storm and launch a "deliberate, unhurried, post--Cold War decision to start a war" without Congressional approval . Critics charge that President George W. Bush largely initiated the Iraq War with little debate in Congress or consultation with Congress, despite a Congressional vote on military force authorization . Disagreement about the extent of congressional versus presidential power regarding war has been present periodically throughout the nation's history . </P> <P> Congress also has the power to establish post offices and post roads, issue patents and copyrights, fix standards of weights and measures, establish courts inferior to the Supreme Court, and "To make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this Constitution in the government of the United States, or in any department or officer thereof ." Article Four gives Congress the power to admit new states into the Union . </P> <P> One of the foremost non-legislative functions of the Congress is the power to investigate and to oversee the executive branch . Congressional oversight is usually delegated to committees and is facilitated by Congress' subpoena power . Some critics have charged that Congress has in some instances failed to do an adequate job of overseeing the other branches of government . In the Valerie Plame Wilson episode sometimes known as the Plame affair, some critics, including Representative Henry A. Waxman, charged that Congress was not doing an adequate job of oversight in this case . Other critics charge Congress was lax in its oversight duties regarding presidential actions such as warrantless wiretapping, although others respond that Congress did investigate the legality of decisions by President George W. Bush involving such matters . </P>

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