A top Russian politician is voicing caution about Jon Huntsman, a former Utah governor who is reportedly set to be President Trump's ambassador to Russia.

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Russian Sen. Alexey Pushkov took to Twitter to call Huntsman a harsh critic of the Kremlin in the past, highlighting his recent tenure as the chairman of a foreign policy think-tank the Atlantic Council.

"The candidacy of the U.S. envoy to Moscow speaks volumes," Pushkov wrote on Twitter on Wednesday.

"Huntsman -- the head of the Atlantic Council, where harsh criticism of Russia has become the norm. Definitely not a dove," he added. Кандидатура посла США в Москве говорит о многом. Хантсман - глава Атлантич.совета, где нормой стала жесткая критика России. Точно не голубь. — Алексей Пушков (@Alexey_Pushkov) March 9, 2017 On Wednesday Huntsman reportedly accepted Trump's offer to become the U.S. ambassador to Russia.

Huntsman served as a U.S. envoy to China under the Obama administration and ran for president in 2012.