Donald Trump rage-tweets at Barack Obama after his predecessor calls him a threat to democracy

President Donald Trump rage-tweeted in all-caps during the Democratic convention as predecessor Barack Obama said Trump was incapable of taking his office seriously. https://www.dailymail.co.uk/news/article-8645825/Donald-Trump-rage-tweets-Barack-Obama-predecessor-calls-threat-democracy.html?ns_mchannel=rss&ns_campaign=1490&ito=1490