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The Constitution is difficult to amend because it requires a supermajority of either members of Congress or a supermajority of state legislatures to propose a new amendment for ratification.
The Appointments Clause [of Article II] clearly implies a power of the Senate to give advice on and, if it chooses to do so, to consent to a nomination, but it says nothing about how the Senate should go about exercising that power. The text of the Constitution thus leaves the Senate free to exercise that power however it sees fit. Throughout American history, the Senate has frequently – surely, thousands of times – exercised its power over nominations by declining to act on them.