John Kelly

The provided articles do not contain information about John Kelly. Article 1 discusses Donald Trump's alleged politicization of the US Armed Forces, specifically mentioning James Mattis. Article 2 focuses on Tom Homan, Trump's 'border tsar,' and his deployment to Minneapolis to lead immigration enforcement following shootings by federal agents. Therefore, it's impossible to provide a summary about John Kelly based on the given context. To generate a summary about John Kelly, articles specifically mentioning him are required.