The Constitution also guarantees "checks and balances." The President, a member of the executive branch, gets to decide whether to sign the bill into law or veto it. If he signs it, then the bill is law. If he vetoes it, then the Congress can override the veto with a two-thirds majority and the bill will become law.
The Congress' main duty is to make and pass laws.
Federal laws
Congress
The purpose of Congress is to make laws.
Congress has the duty and the right to make the laws on trading. Congress was specifically granted the power over interstate commerce.
Laws
laws
== == The Congress. Art. I, sec 1 of the Constitution.
To pass laws.
The Constitution gives Congress the power to make laws for the District of Columbia.
The Congress' main duty is to make and pass laws.
Congress can't make laws about marriage and can't make any laws that take away your rights.