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Hillary CANCELS appearance at 'Most Powerful Women' summit where Tulsi Gabbard is scheduled to speak, after Clinton accused the Democratic candidate of being a 'Russian asset' groomed to run as a third-party candidate for president in 2020.

Clinton backed out of appearance at Fortune's Most Powerful Women Summit.

She had been scheduled to speak there next week, as well as Rep. Tulsi Gabbard.

Clinton confidante insists she backed out of event because of Kirstjen Neilsen.

Clinton launched a feud with Gabbard on Thursday, calling her a 'Russian asset'.

Combat veteran Gabbard said the former Secretary of State is waging a smear campaign against her because 'she knows she can't control me'.

Gabbard tweeted that Clinton was 'the queen of warmongers'.