Jimmy Carter did it throughout the run up to the Iraq War, and is still doing it. Before this administration, Kerry did it at least twice. First, when he met with the North Viet Namese at the Paris talks (during the Nixon administration); and, second, when he mwt with Daniel Ortega (during the Reagan administration). There are examples up many other Democrats doing the same. Their support for the Marxist government of Ortega in Nicaragua is the most notable in this regard. Remember Texas congressman (as Speaker of the House) Jim Wright.
You can go to your room!