The President suggests laws, and Congress makes laws. A President can stop a bill from becoming a law (that's called a veto), but it can become a law anyway if at least 2/3 of each house of Congress vote in favor of it (that's called overriding the veto).
A President may not legally decide which Federal Laws he/she will enforce and which he/she will not enforce. (Regarding the question of why we keep allowing him to do so, I don't have the answer to that.)
Congress suggests laws and policies.
Laws
Congress
make laws
The presdent and the congress
make laws
The major function of the US Congress is to make laws. Laws are passed by both houses of the Congress and sent to the President for signature.
The US Constitution charges Congress with the responsibility of making laws.
To make laws for the united states
In the US, Congress is divided into "Houses" (sometimes called chambers). Both houses of Congress -- the US Senate and the US House of Representatives -- are part of the Legislative Branch of government. The Senate and House of Representatives make laws together. Under most circumstances, they have to agree by a simple majority vote.
The Congress is the Legislative Branch. Its main function is to make laws. It also oversees the execution of these laws, and checks various executive and judicial.
Congress