Ex-cop could get eight years in prison for role in storming U.S. Capitol
A former Virginia police sergeant who joined Donald Trump's supporters
Robertson's defense attorney is asking for a sentence of no more than 15 months
Prosecutors said Robertson later destroyed the cell phones they had been using that day.
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Prosecutors said Robertson "anticipated violence" on Jan.
He drank to cope with stress, he said, and fell deep into the "rabbit holes of election conspiracy theories."
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