This had to be planned.
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Macron would not insult the President like this at the White House.
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The way Trump and Malania are both holding the two middle fingers of Macron looks as though they knew it was coming. Otherwise, it would have been easy to look the hand lock as it could have been interpreted as Macron trying to let go of their hands.
I think it is a message to EVIL. That they are on to them.