They probably use the check and balance system you learn about in 2nd grade.
The president can veto bills.
Constitutionally speaking - only by wielding the power of veto.
Politically speaking - by virtue of the fact that he is the elected leader of his political party he may sway, by power of persuasion, members of his party to his line of thinking.
Once a bill is signed into law, only the Judicial Branch can 'check,' or alter, the effect of the bill that Congress (the Legislative Branch) passed, and that The President (the Executive Branch) signed into law.
Congress checks the President by giving their approval to all appointments and treaties. They also can impeach the President and override his vetoes.
The president can veto bills.
the congress can veto a law the president passed
The President checks Congress when he vetoes a bill
The Congress has to approve the president's budget to provide checks and balances where necessary.
congress and the supreme court
checks and balances
The Congress and the judiciary
the president can veto any bill passed by congress, which requires 2/3 of both houses to override
The president can veto bills passed by Congress.
checks and balances
The President has the power to veto congressional legislation.
Checks and balances between Congress and the president are intended to limit the potential powers of both.
This deals with the system of Checks & Balances. The President can "check the authority of Congress" by rejecting a unconstitutional law proposed by Congress. this process is called veto.The President checks Congress when he vetoes a bill that the Congress has passed. Congress can check him if a 2/3 majority votes to override his veto.Also, the President can check Congress by using the media (the "bully pulpit") to set the agenda for Congress. Presidents also tend to have success with Congress proportional to their approval rating with the public. Thus, if a president has a high approval rating, it is likely that Congress will be willing to help him accomplish his goals.