(CNN) President Donald Trump's top aides are staying silent about the possible anti-Semitic, racist and anti-Muslim origins of a video the President tweeted Sunday, declining to answer a series of CNN questions about the video and its self-proclaimed originator. A Reddit user who has posted anti-Semitic graphics in the past has taken credit for the video that shows Trump pummeling a man with a CNN logo as his head. The video, which superimposes the CNN logo over WWE's CEO Vince McMahon's face, is titled, "Trump takes down fake news." The Reddit user's previous anti-Semitic posts were published before the video...