By Lizzy Buchan Tory plotters have been told it’s “too late” to get rid of Rishi Sunak before the next election as the Prime Minister claimed his warring party was united. Mr Sunak tried to launch a fightback after a weekend of swirling rumours that fed up MPs want to replace him with Commons Leader Penny Mordaunt. Allies of Ms Mordaunt have dismissed the reports and blamed right-wingers for whipping them up. A source close to the top Tory said: “There’s clearly a concerted effort to brief outright codswallop to anybody who will listen and I think the evidence suggests most people don’t buy it…