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In a letter to Senator Richard Shelby on Saturday, Sessions has written that his decision to appear comes in light of last week's testimony by fired Federal Bureau of Investigation (FBI) Director James Comey.
Sessions had been scheduled to discuss the Justice Department budget before a Senate panel chaired by Shelby.
Sessions says it's clear the Russian investigation would become the focus of questioning.
Sessions recused himself from a federal investigation into contacts between Russia and the Trump campaign after acknowledging that he had met twice last year with the Russian ambassador to the US.
He said during his confirmation hearing that he had not met with Russians during the campaign.