Yellen had come under fire from Republicans after admitting she was "wrong" last year in forecasting that inflation would be transitory and quickly subside. She is facing tough questions on the issue from the Senate panel and from the House Ways and Means Committee on Wednesday.
"Well, when I said that inflation would be transitory, what I was not anticipating was a scenario in which we would end up contending with multiple variants of COVID that would be scrambling our economy and global supply chains, and I was not envisioning impacts on food and energy prices we've seen from Russia's invasion of Ukraine," Yellen said.