Experts aren’t even mentioned in the Constitution. From Andrew Napolitano at lewrockwell.com:
I have often thought that after Abraham Lincoln, Woodrow Wilson was our worst president. By worst is meant least faithful to the Constitution and most destructive of personal liberty.
With the exception of Lincoln’s dictatorship — during which the federal government used violence to crush the states’ natural right to secede from a compact they had voluntarily joined, and instead brought about the systematic murder of 750,000 persons — America from its founding to the early part of the 20th century more or less enjoyed the James Madison model for the federal government.
Under this model, the federal government could only legislate, regulate, spend and govern in the 16 discrete areas of human behavior that the Constitution delegated to it. All other areas of human behavior were left free to individual choices or governance by the states.
From and after Wilson’s presidency, the Madisonian model was replaced by the Wilsonian one. Under this model, the feds could legislate, regulate, spend and govern in any areas of human behavior for which there was a national political will, except for those areas that are expressly prohibited to them by the Constitution.