Now, just as special counsel Robert S. Mueller III’s report appears to have cleared President Trump of conspiracy with Russia, the president’s supporters and son are pushing a new angle — the real collusion wasn’t between Trump and Russia but between Hillary Clinton and Ukraine. This bizarre narrative didn’t come from nowhere. It came from Kyiv, where Ukrainian President Petro Poroshenko is fighting for his political life in a hotly contested presidential election. The path it took to Fox News, the president’s Twitter feed and our broader national discussion gives us an eye-opening look into how foreign powers can play an obsessive president, a sycophantic television channel and a social media echo chamber.

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