Following the resignation of Boris Johnson's brother, the prime minister has been questioned on how well the public can trust him. Jo Johnson quit as a government minister and MP because of an "unresolvable tension" between "family loyalty and the national interest". Jo Johnson's announcement adds to a bruising week for his brother who is reeling after four defeats in the House of Commons in two days, including being blocked in his move for a general election this month. SUBSCRIBE to our YouTube channel for more videos: www.youtube.com/skynews Follow us on Twitter: twitter.com/skynews and twitter.com/skynewsbreak Like us on Facebook: www.facebook.com/skynews Follow us on Instagram: www.instagram.com/skynews For more content go to news.sky.com and download our apps: Apple itunes.apple.com/gb/app/sky-news/id316391924?mt=8 Android play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB