Trump adviser Roger Stone on the biggest political dirty trick of all time, Four Corners

Roger Stone, a longtime ally of US President Donald Trump and adviser to his 2016 presidential campaign, has been charged with making false statements and witness tampering, according to a grand jury indictment made public by US Special Counsel Robert Mueller s office. He maintains his innocence. In this Four Corners interview with Sarah Ferguson he talks about his relationship with Donald Trump. For more from ABC News, click here: Follow us on Twitter: Like us on Facebook: Subscribe to us on YouTube: Follow us on Instagram: