What position did Thomas Jefferson take in the debate over the Constitution?

Jefferson was the principal author of the Declaration of Independence in 1776 and also a mentor to James Madison, a driving force behind the 1787 Constitutional Convention.

Prior to then, Jefferson certainly wrote about and debated constitutional issues. Also back in 1776, Jefferson was unable to attend the Virginia state convention that drew up the Virginia Declaration of Rights, but he sent his own version of a draft constitution back to his home state to consider.