Hunter Biden has escalated his legal battle against Fox News for publishing intimate photos and reporting he had taken illegal bribes, and MSNBC’s Claire McCaskill said Donald Trump was ultimately to blame for the network’s coverage. Lawyers for president Joe Biden’s son plan to sue the network “imminently,” according to a letter sent to Fox News demanding retractions, corrections and other remedies, and “Morning Joe” co-host Mika Brzezinski suggested the conservative network had published and broadcast what amounted to revenge porn. “I think that Fox lawyers will have to look at what exactly …