The planned appeal by the four men convicted of a failed bomb plot hinges on whether the home-made explosives they were carrying were viable.
All four men claim that the plot was an elaborate hoax and that they never intended carry out a bombing.
However, the Forensic Explosives Laboratory (FEL), a top security government facility which tested the devices, concluded that they would have worked had the chemical recipe been correct.
It is this conclusion that will be called into question if the men file appeal papers.
More top news
In a tweet on Saturday, the US president didn't give a reason for his absence but said he wished"everyone well and have a great evening".
Weather conditions remain wet and windy through the weekend.
Mr Banks has given Ukip leader Paul Nuttall an "ultimatum", saying if he is not made chairman he will stop supporting the party.