An Arizona Republic survey of Sen. John McCain-related tweets collected in an NBC News database of messages finds that Russian accounts routinely spread insults and conspiracy theories smearing McCain as a “traitor” and a “RINO.”

“That the Russian Twitter trolls sought to discredit McCain, R-Ariz., was perhaps predictable given the six-term senator’s longstanding criticism of Russian President Vladimir Putin, who officially sanctioned McCain in 2014.”

Sources in the Senate tell CNN they have been worried about Sen. John McCain recently.

“The sources described McCain as looking increasingly frail and said he has not spoken up in recent GOP meetings the way he had before, in addition to his absence this week for treatment at Walter Reed Medical Center.”

”One source said that McCain always used to speak up in these meetings, and that he hasn’t at all recently. The source was not commenting on McCain’s mental acuity, but on his energy level, and pointing out that his lack of participation was not normal.”

Sen. John McCain (R-AZ) “has been admitted to Walter Reed National Military Medical Center for recovery from the side effects of another round of treatment for brain cancer,” the Washington Post reports.

“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.”

Sen. John McCain (R-AZ), “who has already warned President Donald Trump against bringing back torture, is vowing to reject any administration nominee who has backed so-called enhanced interrogation techniques,” Politico reports.

“McCain was the sole GOP senator to vote against confirming Steven Engel to lead the Justice Department’s Office of Legal Counsel earlier this week, citing his role in the controversial torture memos under the George W. Bush administration.”

Sen. John McCain (R-AZ) says doctors have given him a “very, very serious prognosis” as he battles brain cancer, CNBC reports.

Of his chances for survival, McCain says: “Some say 3 percent, some say 14 percent.”

“McCain underwent surgery in July for a brain tumor that was later found to be a form of glioblastoma, the same type of cancer that took the life of Sen. Edward M. Kennedy in 2009. McCain said that he thinks about Kennedy a lot. He says Kennedy continued to work despite the diagnosis and ‘never gave up because he loved the engagement.'”