Sir Keir Starmer will chair a cabinet session today after earning a lifeline from Labour MPs during a crunch meeting in which he declared: "I'm not prepared to walk away." The prime minister started the week battling the biggest crisis of his premiership amid the fallout from his appointment of Lord Mandelson as his US ambassador, as more revelations about the disgraced peer's relationship with paedophile Jeffrey Epstein are revealed. There have been growing doubts since last week about whether the PM would stay in post - and for how long. But speaking to a meeting of the Parliamentary Labour Party on Monday night, just hours after Labour's leader in Scotland demanded he quit, Sir Keir came out fighting. Having arrived with a "face like thunder", Sky's chief political correspondent Jon Craig said the prime minister got a "very good reception" from his MPs as he vowed to take on his critics and opposition parties. #Starmer #Politics #UKPolitics 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 Sky News Daily podcast is available for free here: https://podfollow.com/skynewsdaily/ To enquire about licensing Sky News content, you can find more information here: https://news.sky.com/info/library-sales