MOSCOW (Sputnik) — The 80-year-old had an emergency surgery in July to remove a blood clot from above his left eye. Subsequent tissue pathology revealed a primary brain tumor, known as a glioblastoma.
"My father completed first round radiation/chemo. His resilience & strength is incredible. Fight goes on, here's to small wins," Meghan McCain, a Fox News journalist, said on Twitter.
Despite his condition, the Republican returned to the Senate earlier in August to cast a deciding vote that derailed President Donald Trump’s plans to repeal the Affordable Care Act, commonly referred to as Obamacare.