Watch again as Donald Trump pleads 'not guilty' on federal charges. The former US president was arraigned today on 37 charges over his handling of classified documents after leaving the White House. It would make Mr Trump the first current or former US president to ever face federal criminal charges. Some of Mr Trump's supporters have vowed to protest outside the courthouse, including a Florida-based chapter of the neo-fascist group the Proud Boys. At least one person convicted for their role in connection with the January 6 Capitol attack, white nationalist livestreamer Baked Alaska, has suggested that he plans to join demonstrations in Miami. Rhetoric surrounding Mr Trump's arraignment is being monitored by authorities and extremism researchers. An advisory issued by Homeland Security on 24 May said: "Lone offenders and small groups motivated by a range of ideological beliefs and personal grievances continue to pose a persistent and lethal threat” to the US." Click here to subscribe to The Independent: https://bit.ly/Subscribe-to-Independent About The Independent: Making Change Happen. The Independent is the world’s most free-thinking newsbrand, providing global news, commentary and analysis for the independently-minded. Connect with The Independent: Check out our full video catalog: null Videos, daily editorial and more: http://www.theindy.com/ Click here to get the best of The Independent daily: https://www.independent.co.uk/newsletters Like The Independent on Facebook: https://www.fb.com/TheIndependentOnline Follow The Independent on Twitter: https://twitter.com/Independent Follow The Independent on Instagram: https://www.instagram.com/the.independent Download the iOS & Android app: https://www.independent.co.uk/subscribe/app Help to support truly independent journalism. Every dollar you contribute will directly fund additional special reports and investigations from a free-thinking, award-winning newsroom you can trust - https://www.independent.co.uk/donations Subscribe to Independent Premium for exclusive content & live events: https://bit.ly/2MiOONB