I think we were fooled before the election into thinking that when a party reviews its main candidates for nomination, they are put to the test for proof of the few requirements the Constitution requires.
Perhaps we need legislation that puts legal requirements duly ON the party who sponsors a candidate for President.
Maybe. Some demonstration that voters have at least a rudimentary understanding of our system would be nice as well.
Agreed. Or, have a positive vetting with concrete documentation by EVERY state before a candidate can participate in any primary.