What are some of the weaknesses of the legislative branch, and what causes them?

A system of checks and balances ensures that no single branch of the American government ever holds too much power. The legislative branch has a large amount of authority, yet it is restricted for the stability of the nation. The House of Representatives and the Senate make up Congress, the legislative branch of the federal government.
The legislative branch is the only part of the government that can create new laws or alter existing ones. The Senate ratifies treaties and confirms appointments made by the President. The House of Representatives ratifies trade agreements and confirms the Vice President. Both chambers together create taxes to fund the government and can even declare war.
The other two branches of government hold unique powers that Congress does not, while also restricting the nature of the powers it does hold. While Congress can make laws, it has no ability to enforce them. The Judicial branch interprets the law and can declare acts of Congress unconstitutional. While Congress confirms, the president appoints principal officers such as federal judges and ambassadors. The executive branch can call special sessions of Congress, propose new laws, or even veto a law in its creation.
In addition to the intentional limitations of Congress, the practice of politicians in the legislative branch can be considered a weakness. Cooperation within Congress leads to the passing of more laws to keep up with the changing needs of America’s citizens. Unfortunately, when a political party holds a significant majority in Congress, the need for cooperation diminishes. Congress can then cater solely to the constituents of one political party. Other times, issues can become deadlocked, stalling the creation of new laws. When there is no will to compromise, the branch becomes inefficient.
https://www.whitehouse.gov/about-the-white-house/the-legislative-branch/