The President can not declare war on another countries.
The only limitation on the President's treaty power is his ability to get the 3/4 of the Senate to ratify his Treaty.
A more interesting question is if the President and Senate create and ratify a Treaty that conflicts with the Constitution. The Supreme Court is the branch that would have to decide what takes precedent.
An example would be where the Constitution has the Supreme Court as the ultimate interpreter of the Constitution yet the President and Senate approve a Treaty making the International Court the ultimate arbiter on international issues.
Because the Senate must ratify treaties with a super majority.
To make treaties and appoint them
by ordering pizza at pizza hut and giving it to congress
they don't
The Senate must approve treaties and presidential appointments.
The power to make treaties and confirm the presidents appointments
the system of checks and balances
The Constitution.
The Constitution limits the president's power based on checks and balance.
It is part of the balance of power. Each branch must check the other and this is one way the President is checked.
The Constitution limits the president's power based on checks and balance.
To limit the presidents power