There was widespread consternation among bankers over a tweet she wrote in July, after JPMorgan Chase took over some small businesses.

Ms Omarova wrote: ‘Does the world need JPMorgan to become bigger and more powerful? I was just wondering.’

Two years ago, she tweeted: “Say what you want about the former USSR, there was no gender pay gap there. dream in our [US] society!”

Mr Biden’s decision to appoint Ms Omarova was reportedly opposed by his Treasury Secretary Janet Yellen and was a decision to appeal to the left wing of his party. She would be the first woman, and the first non-white, controller.

With the Senate split 50-50 and Vice President Kamala Harris holding a casting vote, opposition from moderate Democrats could derail the nomination.

Pat Toomey, the top Republican on the Senate Banking Committee, accused Ms Omarova of espousing “extreme left-wing ideas”, adding: “I don’t think I’ve ever seen a more radical choice for a regulatory position in our government. federal.”

He said: “The Soviet regime was so deeply evil, and America is so big, and yet it doesn’t seem to see it quite that way. What it wants to do, and I quote, is her words – ‘effectively ending banking as we know it.’ She clearly has an aversion to anything resembling free market capitalism.”