MADISON, Wis. (AP) — U.S. Sen. Ron Johnson says the Russian government has denied him a visa to visit the country as part of a congressional delegation.

Johnson issued a news release Monday saying he had been denied a visa by the government of the Russian Federation to enter the country as part of the delegation. Johnson is chairman of the Senate Foreign Relations Committee’s Subcommittee on Europe and Regional Security Cooperation.

The release doesn’t say when he had planned to visit Russia, who else is on the congressional delegation or why he was denied a visa. Johnson’s media team didn’t immediately respond to emails.

Johnson says in his release that he has supported legislation that aims to hold Russia accountable for aggression in Ukraine and targeting dissidents.