Donald Trump on Wednesday night lobbed a new attack at Fox News. Trump, who has had an on-and-off grudge against the network for several years, now says the outlet is risking its “conservative” chops by platforming independent candidate Robert F. Kennedy Jr. Kennedy was running as a Democrat before changing to independent. “So bad that Fox News puts RFK Jr., considered the dumbest member of the Kennedy Clan, on their fairly conservative platform so much,” Trump posted on his social media platform, Truth Social. ALSO READ: A criminologist explains how Americans achieve a post-Trump democracy “C…