Everything seemed set for a photo op with tech and AI CEOs surrounding President Trump on Thursday as he signed a much-anticipated executive order on AI and cybersecurity. But it fell apart hours before the order was to be signed, as a top Trump adviser and some tech executives gave it a big thumbs down. And the president didn't really want to regulate AI in the first place. Why it matters: Any further delay of the order means more time for infighting and for the text to get bogged down in disagreements among different parts of the government and industry. Behind the scenes: Before the order was to be signed, Trump, AI adviser David Sacks and some in industry discussed it, sources familiar told Axios. The main reason the signing was delayed was that Trump "just hates regulation," one source familiar said, adding that Sacks also "hated it." "The whole thing was unnecessary" and "just something doomers wanted," the source added.…