Even if somehow, some way, Trump did not know this in advance(!), he certainly could see how his TS post looked as soon as he posted it
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He might not have seen it. I sometimes write a comment on free republic, post it, then close the window and open another program.
Some people will make excuses for him no matter what. The man is running for President of the United States. He and his staff know his every post is scrutinized. He made the post on Thursday, and it stayed up until he deleted on Friday afternoon. Something is very wrong if Trump and none of his staff noticed the images in all that time.