Via Think Progress, the usual suspects:
…Senator Kit Bond: The Constitution says nothing of the subject of filibuster and it says nothing of the power of a minority to defeat the president’s judicial nomination….
….It is the product of a rule of the Senate, passed many years after the ratification of the Constitution. This rule does not derive from the authority of the Constitution….
“…This rule does not derive from the authority of the Constitution….”
The United States Constitution, Article I, Section 5, Paragraph 2:
…Each House may determine the rules of its proceedings, punish its members for disorderly behavior, and, with the concurrence of two thirds, expel a member….