Amal Clooney has quit her role as the UK's special envoy on media freedom over the Government's 'lamentable' Brexit plan.The human rights lawyer was appointed last year.But in a letter to foreign secretary Dominic Raab, Mrs Clooney said she had no alternative but to resign due to the Government's plan to violate an international treaty by rewriting parts of the Brexit Withdrawal Agreement."Although the Government has suggested that the violation of international law would be 'specific and