(CN) — Alternative for Germany, a far-right anti-immigrant party that now tops opinion polls only two months after it scored historic gains in national elections, was classified as a threat to democracy on Friday by the country's domestic intelligence agency.

Secretary of State Marco Rubio advised Germany to “reverse course” following the domestic intelligence agency’s decision, which grants German authorities increased oversight and surveillance over the party.

Germany’s intelligence service officially classifies the AfD as a right-wing extremist party, enabling nationwide surveillance.