In heated exchanges in the Commons today, shadow home secretary Yvette Cooper labelled the handling of Qatada's deportation a "farce".
"So on the Tuesday night deadline, while Abu Qatada was appealing to European Court judges, the Home Secretary, who thought the deadline was Monday night, was partying with X Factor judges," she said.
The Home Secretary insisted the appeal was launched after the deadline expired at midnight on Monday, but that the court had no automatic way of rejecting it on those grounds.
May was at a function on Tuesday night also attended by X Factor judge Tulisa Contostavlos.
Another twist in a political storm that has left critics questioning whether the Home Secretary has mishandled the Abu Qatada deportation
Law experts attending a conference on the future of the European Court of Human Rights believe the Home Secretary has got her dates wrong.
Clarity over Abu Qatada's appeal deadline will only come from the European judges. There will be lots of arguing over details.