The drugs used in a botched lethal injection in Oklahoma were the subject of an appeal from lawyers representing two death row inmates.
The execution of Clayton Lockett was stopped after the drugs he was administered "weren't working as designed", prison officials said.
Lawyers for Lockett and fellow inmate Charles Warner had argued before the botched execution that the use of an untested cocktail of drugs could subject their clients to "cruel and unusual punishment", which is prohibited by the US constitution.
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Accused Darren Osborne was a "ticking time-bomb" who had become "obsessed" with Muslims in the weeks before the incident, a court has heard.
Ukip's ruling committee unanimously backed a vote of no confidence in Mr Bolton on Sunday and six key party figures have also resigned.
A much improved day across the UK. Rain spreads in through this evening and overnight with the heaviest bursts across western Scotland.