Moise Katumbi, the opposition presidential hopeful in the Democratic Republic of Congo, has flown to South Africa for medical treatment, his lawyer says, a day after authorities issued an arrest warrant for him.
He was accused of hiring foreign mercenaries in an alleged plot against the state, which he denies.
Mr Katumbi’s lawyer said he had been in hospital since police had fired tear gas during a protest.
Elections are due in November.
Prosecutors allowed him to travel for treatment on condition that he returned to face the criminal charges against him.
Lawyer Georges Kapiamba said Mr Katumbi was taken to hospital in Lubumbashi, after police fired tear gas at him and his supporters.
The politician was weak but boarded the flight unaided, he added.
Mr Katumbi has condemned the charges against him as an attempt to stall his campaign to replace President Joseph Kabila in November polls.
Mr Kabila, in power since 2001, is nearing the end of his second term and he is constitutionally obliged to step down by December.
But there is growing political tension as it is not clear if he will relinquish power.