Hungary's prime minister Viktor Orbán, who has suppressed civil liberties and intimidated media and corporate critics, will address the Conservative Political Action Conference in Dallas.
Pipeline deliveries, which are critical to Hungary, Slovakia and the Czech Republic, won't be affected by the ban. The much more complicated issue of Russian natural gas remains unresolved.
A coalition of opposition parties made an appeal to voters before Hungary's election on Sunday, which decides whether nationalist Prime Minister Viktor Orban will win a fourth consecutive term.
The Artistic Freedom Initiative contends that consolidated state power under right-wing Prime Minister Viktor Orbán and artists' self-censorship has led to an "existential crisis."
Taking Klubradio off the air was the latest blow to press freedom in a country where the right-wing populist leadership and its allies have increased control and influence over the media.
