The White House has said the botched execution of a death row prisoner in Oklahoma fell short of the humane standards that must apply to carrying out the death penalty.
The execution of Clayton Lockett was stopped when he regained consciousness after receiving a lethal injection, before dying from a heart attack around 30 minutes later.
ITV News Washington Correspondent Robert Moore reports.
More top news
Jeremy Corbyn's economic policies would harm the poor and leave the Tories in power for a decade, Chris Leslie has warned.
Landlords have been warned they could face up to five years in prison if they fail to remove illegal immigrants from properties.
A picture of Cecil the lion - the animal killed by an American dentist in Zimbabwe - has been projected on to the Empire State Building.