Tucker Carlson's interview with Russian President Vladimir Putin will air on Thursday evening on X and his own website, while Hillary Clinton called him a 'useful idiot' for doing so.

In a Wednesday Instagram post, Carlson said the sit-down, which has already been recorded, would be broadcast at 6 p.m. Eastern on his website and the social media platform.

The former Fox News host, a key ally of 2024 election candidate Donald Trump and a vocal opponent of US military aid for Ukraine, traveled to Moscow for Putin's first interview with a Western journalist since Russia's February 2022 invasion of Ukraine. 

Hillary Clinton, speaking on MSNBC Wednesday, joked that she 'would not be surprised if he emerges with a contract with a Russian outlet, because he is a useful idiot' in response to the news. 

Carlson's access to Putin is a huge contrast with restraints on other foreign journalists in Russia, where two US citizens - Wall Street Journal reporter Evan Gershkovich and Radio Free Europe's Alsu Kurmasheva - are currently imprisoned.

Carlson's hit show on Fox came to an end in April, days after the right-wing cable network paid a settlement approaching $800 million to end a defamation case over false allegations that ballot-counting company Dominion Voting Systems had helped steal the 2020 presidential election from Trump. 

He has since broadcasted shows on X, formerly Twitter, but his interview with Putin represents his biggest score since his departure from Fox.