The US Congress consists of 2 houses. The <em>House of Representatives</em>, with its 435 members and <em>The Senate</em>, with its 100 members.
In a decision-making process, it is always better to have more participants that could help come up with a better proposal or solution to a certain issue. When it comes to policymaking, having an organized group of individuals who will debate over the country's matters will offer you a greater probability of coming up with better policies in comparison to one single person. The President does have a group of advisors but in the end, it is only he or she which has the last word.
The Supreme Court has the power of <em>Judicial Review</em>. This means that it can invalidate a law that is passed by a Congress by the argument that it goes against a part of The Constitution. It can also invalidate an executive act from the President by considering it to be unlawful.
