The UK’s former Brexit minister on Monday became the latest senior Conservative MP to pressure Prime Minister Boris Johnson to scrap a tax hike due in April. Lord David Frost, who recently resigned from the Cabinet over the government’s taxation and other policies, denounced the scheduled £12 billion ($16 billion) National Insurance hike as being neither necessary nor justified, and even less so during a cost-of-living crisis. “The tax rises this April were never necessary or justified,” Frost told the Daily Mail. “Given the new pressures on energy prices and inflation, it’s even more important now to scrap these tax increases and focus on getting the economy growing again. Allowing people to keep more of their own money is always the best way,” he said. Frost’s remarks echoed comments from another former Brexit secretary, David Davis, who also called for the proposed tax hike to be scrapped in the face of …