Former Home Secretary Lord Brittan says an allegation of rape against him is "wholly without foundation".
"It is true that I have been questioned by the police about a serious allegation made against me. This allegation is wholly without foundation," he said in a statement.
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Accompanied by the Duke of Edinburgh, the Queen will attend the opening ceremony of the fifth session in the Holyrood chamber.
Ms Leadsom has received the backing of Ian Duncan Smith, the former work and pensions secretary.
The former shadow work and pensions secretary is considered a more viable candidate than Angela Eagle, a Labour source has told ITV News.