Thomas Jefferson’s belief that government can do only what the Constitution specifically says is known as "express powers".
Thomas Jefferson was an American statesman, diplomat, architect, and Founding Father who served as the third president of the United States from 1801 to 1809. Prior to his presidency, he had served as the second vice president of the United States from 1797 to 1801. He principal author of the Declaration of Independence, and a proponent of democracy, republicanism, and individual rights motivating American colonists to break from the Kingdom of Great Britain and form a new nation.