This is unusual.
The new UK “Brexit minister” David Davis is involved in a court case in the European Court of Justice (ECJ) – suing the British government over personal data rights.
Furthermore, the law he is challenging was introduced by his new boss, Prime Minister Theresa May, during her time as Minister for Home Affairs.
“The choice of Mr Davis is a remarkable one in some ways. A sincere civil libertarian, as well as a pro-Brexit campaigner, he is one of a group of claimants suing the UK government at the European Court of Justice to enforce EU law on an allegedly non-compliant UK in respect of personal data rights. This case — which is reliant on the very charter of fundamental rights loathed by many in his own party — has already seen a decision of the high court saying an act of parliament was incompatible with EU law (though this was not upheld on appeal, it was referred to the ECJ instead).”
FT: David Davis, Brexit and the shapelessness of things to come »