Officials have said the US Secret Service has fatally shot a man who opened fire on officers at a security checkpoint near the White House in an exchange of gunfire. Sky News' US correspondent David Blevins, at the scene in Washington, says there have been three attempts on Donald Trump's life in two years - and this latest incident will raise questions about the president's security. SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews Follow us on Twitter: https://twitter.com/skynews Like us on Facebook: https://www.facebook.com/skynews Follow us on Instagram: https://www.instagram.com/skynews Follow us on TikTok: https://www.tiktok.com/@skynews For more content go to http://news.sky.com and download our apps: Apple https://itunes.apple.com/gb/app/sky-news/id316391924?mt=8 Android https://play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB Listen to our new podcast This is Why, available for free here: https://podfollow.com/thisiswhy To enquire about licensing Sky News content, you can find more information here: https://news.sky.com/info/library-sales