One of the oddities of the U.S. Senate is that it is not based on majority rule.
Instead, the Senate allows the legislative filibuster which means that 40 Senators can block the wishes of the other 60.
Now, President Trump is urging the Senate to switch to the simple concept that the rest of the country runs on – that of majority rule.
The U.S. Senate should switch to 51 votes, immediately, and get Healthcare and TAX CUTS approved, fast and easy. Dems would do it, no doubt!
— Donald J. Trump (@realDonaldTrump) May 30, 2017
The Constitution provides for a supermajority for a few key items such as impeachment, treaty ratification, constitutional amendments, and overriding presidential vetoes.
However, on other items, such as health care or tax reform, it is the rules of the Senate, not the Constitution that require 60 votes to override a filibuster.
Congress routinely ranks near the bottom in polls of how Americans feel about institutions and one of the reasons cited is the inability to get things done. This change to a simple majority would provide for an institution that was more responsive to the will of the people.