That is not entirely true - the President now has the power to order the assassination of US Citizens outside the US, at his whim, a power he has already exercised. Persons subject to the Constitution have already been detained without council for "suspicion" and removed to Guantanamo.
Just because Paul has some views which are deplorable does not mean that his opinion here is as well - furthermore, he is not the first in line with his criticism of this - we have been discussing this issue for several weeks here ...
FDR had American citizens put to death without a civilian trial. Nothing new. But if you are on a battle field acting as an illegal enemy combatant trying to assist in the killing of American troops then too fing bad if you get a bullet in the head without a trial.
You are telling me a lot about yourself by the fact that it bothers you that such a traitor isnt treated like a mere criminal.
War is war and is not some game of cops and robbers. If you want to go play on the battle field as an American citizen then too bad if get to find out what the game is all about.
On every issue of National Security the views of Ron Paul are deplorable, I doubt this issue is any different.