According to the U.S. House of Representatives, Congress is responsible for making federal laws. Both the Senate and the House of Representatives are involved. The White House website indicates that the Senate has 100 members while the House has 435.
According to the White House website, there are many obstacles that must be overcome to create a law. The attempt often fails. The successful process for developing a law begins when a member of Congress sponsors a bill. It goes to a subcommittee and then to the full committee. Either group is allowed to change the bill or accept it as it stands. After acceptance by the full committee, the bill is sent to the head of the majority party in the congressional house that proposed the bill, and it is scheduled for consideration. After it is approved by that house of Congress, it is sent to the other. When it receives a majority vote there, the bill goes to the president, who signs it into law.