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Reuters
Roger Stone is a political lobbyist and an ally of President Donald Trump
Political strategist Roger Stone, a long-time ally of President Trump, has been arrested in Florida, charged with seven counts in the Mueller probe.
Mr Stone will appear in court later in the city of Fort Lauderdale.
The indictment includes one count of obstruction of an official proceeding, five counts of false statements, and one count of witness-tampering.
Special Counsel Robert Mueller is investigating alleged collusion between Russia and the Trump campaign.
In 2016, US intelligence agencies concluded that Russia had used a state-authorised campaign of cyber attacks and fake news stories planted on social media in an attempt to turn the election in Mr Trump’s favour.
The president has branded the Mueller inquiry a political “witch-hunt”. The Kremlin denies meddling in the US vote.
So far Mr Mueller’s investigation has led to charges against more than two dozen Russians, as well as several people connected to Mr Trump himself, including his former national security adviser Michael Flynn, and Paul Manafort, the former chairman of his election campaign.
Mr Stone was detained in a pre-dawn arrest.