Zimbabwe’s main opposition leader, Morgan Tsvangirai, is critically ill in a South African hospital and his supporters should “brace for the worst”, a party source with knowledge of his condition said on Tuesday. The 65-year-old has been in and out of hospital since disclosing in June 2016 that he had colon cancer. He returned to Johannesburg in neighboring South Africa for his latest round of treatment in early January. “From the medical report that I received yesterday the situation is not looking good. He is critically ill and we should brace for the worst,” the source said.