What are the constitutional constraints on the presidency? Who holds them?

What will be an ideal response?

The presidency is powerful, but this power is constitutionally limited, especially by Congress. A majority in Congress, for example, is required to pass laws, create and fund programs, and confirm presidential appointments that are necessary to fully realize their policy objectives. The president must obtain from the Senate majority approval to confirm appointments to the federal judiciary as well as to many executive branch offices. Ratification of a treaty requires a two-thirds vote in the Senate. With a two-thirds vote in each chamber, Congress can override a presidential veto, though veto overrides are relatively uncommon given the high vote hurdle needed to succeed. Congress also has the ultimate power to undermine the president, by impeaching and convicting the officeholder, removing him or her from power.