Suella Braverman has been accused of a "cowardly" attack on civil servants after she emailed Tory members slamming officials for blocking policy over small boat crossings.
In a blistering letter to Rishi Sunak, the General Secretary of the FDA union, asked the Home Secretary to withdraw her comments and apologise.
Dave Penman also suggested the Cabinet minister may have breached the ministerial code and risked "stoking tensions" over the issue.
