The UK’s national security adviser, Jonathan Powell, is under pressure to distance himself from a comment made by his wife, the award-winning writer Sarah Helm, in support of Palestine Action.The post was made in defence of the critically acclaimed Irish novelist Sally Rooney, who said she had been forced to pull her books from shelves in the UK after pledging proceeds from their sales to Palestine Action.Helm, a former Sunday Times journalist and diplomatic editor at the Independent who spent many years covering the Middle East, wrote on X indicating support for the direct action group, which was proscribed last...