WASHINGTON – Speculation swirled on May 22 over the last-minute collapse of US President Donald Trump’s planned executive order on powerful AI models, with fingers pointing at the president’s allies in Silicon Valley who oppose government oversight of the technology.A draft of the shelved order leaked to US media shows the White House had prepared new AI cybersecurity measures before he pulled the plug on May 21. His former AI czar had reportedly called Mr Trump directly to raise objections.The collapse is the latest sign that Washington remains unable to agree on even modest guardrails for the technology – leaving…