Donald Trump issued a test of Fox Corporation’s loyalty by demanding the media company dump Paul Ryan from its board of directors. The former House speaker declared Trump “unfit for office” earlier this month on Fox News, and he has previously written him off as an “authoritarian” and a “narcissist” — and the presumptive Republican nominee decided to seek revenge. “Nobody can ever trust Fox News, and I am one of them, with the weak and ineffective RINO, Paul Ryan, on its Board of Directors,” Trump posted on Truth Social. “He’s a total lightweight, a failed and pathetic Speaker of the House, an…