By Dave Burke Rishi Sunak plans to batter the long-term sick after being accused of acting like Liz Truss over his plans for £46billion unfunded tax cut. The PM says he wants to abolish National Insurance if the Tories stay in power – fuelling claims of recklessness. Now he has suggested that it can be achieved by slashing benefits. It is estimated National Insurance Contributions (NICs) raise £46billion for the public purse every year.. In an interview with the Sunday Times he said he had set his sights on the 2.5 million working age people signed off as unfit to work. The former Chancellor -…