Otherwise he would have too much power.
The President can make treaties but only with the advice and consent of the US Senate. Congress may give him some discretionary power to control trade, but the ultimate power over foreign trade rests with Congress.
The President has almost all the power in foreign relations. Congress is only needed to sign treaties and keep troops in an area for more than 60 days.
He/She can make treaties, but they need to be approved by Congress.
No, it cannot. The power to make treaties with foreign countries is expressly reserved to the president under Article II of the US Constitution. The only role Congress plays is that treaties are subject to the advice and consent of the Senate. Note that "Congress", (i.e. the Senate and House of Representatives together) does not have a role in approving treaties. Only the Senate has such a role.
The role that the president plays when he deals with foreign leaders is to negotiate on behalf of a nation. He acts as the representative of the entire nation.
Congress does not have to give approval to appoint the President's choice for Secretary of State. However, a confirmation hearing takes place before the Senate Foreign Relations Committee.
The President of the U.S. has the power to make treaties with foreign countries, but must be confirmed by the U.S. Senate. He also has the power to enter into executive agreements (secret treaties) with no Senate confirmation needed.
War Powers Act
Treaties made by the United States with a foreign power must be ratified by Congress.
Under Article II of the Constitution, the President is granted the power to deal with foreign affairs: this can be entering and discussing treaties, policy decisions, meetings with foreign heads of state, and executive agreements. However, treaties that the President enters into must be approved by Congress (2/3)--these are called congressional executive agreements, and they can be ex-ante or ex-post. Further, Congress can delegate certain elements of its own powers, such as law-making, if it is deemed to be closely connected with the President's goals of foreign policy.
The Senate.
The chancellor of congessional foreign affars.