Jacob Rees-Mogg has insisted the prime minister was not aware of the alleged Downing Street party as he had not received the email invitation from his private secretary Martin Reynolds. <br /> <br />The House of Commons leader added Boris Johnson was a "formidable leader" who had solely faced difficulties as "all prime ministers" do. Report by Alibhaiz. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn