Democratic Sen. Amy Klobuchar said Tuesday that the selection of Rex Tillerson to be secretary of state is troubling both because of his Russian connections and his lack of diplomatic experience.

Speaking on CNN, Klobuchar said that while the Exxon Mobil CEO might have business dealings with countries all over the world, that’s not the same as having foreign policy experience. She added that his selection at a time when fears over Russia’s hacking of U.S. political networks are at an all-time high is worrying.