Sen. John McCain, who was diagnosed with brain cancer last year, has made the decision to discontinue medical treatment, his family said in a statement on Friday.
"Last summer, Senator John McCain shared with Americans the news our family already knew: he had been diagnosed with an aggressive glioblastoma, and the prognosis was serious.
With his usual strength of will, he has now chosen to discontinue medical treatment," the family of the Arizona Republican said in a statement.
McCain, the 2008 Republican presidential nominee, is a key voice in the Republican Party and an icon of the Senate.
Cindy McCain, the senator's wife, wrote in a tweet, "I love my husband with all of my heart.
John, Cindy, and the entire McCain family are in our prayers at this incredibly difficult hour," McConnell tweeted.
Arizona Republican Gov. Doug Ducey said in a statement, "John McCain is an American hero, always putting country before self. »