Washington (CNN) Speaker Nancy Pelosi slammed Treasury Secretary Steven Mnuchin on Thursday, calling a closed-door briefing on Russia sanctions "a waste of time" and "one of the worst classified briefings" she'd received during the Trump administration.

Pelosi said that Mnuchin mostly read from an unclassified document and let other officials do most of the talking.

"The secretary barely testified at all," she said.

House Democrats called the hearing under a 30-day review window following Treasury's notification in December that sanctions would be lifted on companies tied to Russian oligarch Oleg Deripaska, a close ally of Russian President Vladimir Putin who also has ties to Trump's convicted former campaign manager Paul Manafort.

Treasury announced last month it would drop sanctions on Rusal, the world's second-largest aluminum producer, as well as EN+ Group, the company that holds Deripaska's stake in Rusal.

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