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Sky News Washington Correspondent Annelise Nielsen says Boris Johnson's former chief adviser Dominic Cummings has become a "vocal critic" of the British Prime Minister.

"He's been highly critical of Boris Johnson since he's left, he's become a vocal critic and he's directing a lot of the media reporting - he's doing the rounds this morning,

"He's likely to give evidence as well, in all of this, at the same time that Boris Johnson's also likely to be interviewed by police."