In this case it was clear he was joking.
Every time he puts his foot in his mouth, apologists rush forward to say "He's JOKING!!"
How about that cute bit about how the Second Amenders will know what to do if Billary wins and has the right to appoint judges. Wasn't that a knee-slapper?
Look. I don't want to vote for the cankles. I won't want it to win. But Trump is making it REALLY hard...