Sen. John McCain (R-Ariz.) has been admitted to Walter Reed National Military Medical Center for recovery from the side effects of another round of treatment for brain cancer, according to his office. McCain, who missed a third straight day of Senate votes Wednesday, has been undergoing rounds of chemotherapy and radiation to treat glioblastoma, the terminal form of brain cancer he was diagnosed with in July. McCain has been undergoing treatments since early September at the National Institutes of Health in Bethesda, next to Walter Reed. Two friends close to McCain, requesting anonymity to speak about his condition, said there...