If a presidential candidate did not know or review the ad, he’s an incompetant boob, a snake-oil selling liar, or a former Arkansas governor.
He broke the law:
UN-15a.Article.43
No citizen shall display the cross of Christ.
How was he to know that a bunch of kooks would make an issue of a friggin' window behind him? If he wanted to show a cross he would have simply had a real cross behind him. Do people think that he thought that having the cross-pieces of a window there would somehow convert people to Christianity against their will or something? Sheesh people, get a grip.