<p>Arizona Sen. John McCain has been diagnosed with brain cancer.</p> 
<p>McCain was in the hospital to remove a blood clot from above his left eye when a tumor was located.</p> 
<p>Doctors revealed that McCain has been diagnosed with glioblastoma, an aggressive cancer. The statement says the 80-year-old senator and his family are reviewing further treatment, including a combination of chemotherapy and radiation.</p> 
<p>The doctors say McCain is recovering from his surgery amazingly well and his underlying health is excellent, according to the statement.</p> 
<p>McCain responded to the "outpouring of support" in seemingly good spirits Thursday, promising over <a href="https://twitter.com/SenJohnMcCain/status/888057312992260097" type="external">Twitter</a> that "unfortunately for my sparring partners in Congress, I'll be back soon, so stand by!"</p> 
<q> <p>I greatly appreciate the outpouring of support - unfortunately for my sparring partners in Congress, I'll be back soon, so stand-by!</p>&#8212; John McCain (@SenJohnMcCain) <a href="https://twitter.com/SenJohnMcCain/status/888057312992260097?ref_src=twsrc^tfw" type="external">July 20, 2017</a> </q> 
<p>The office of McCain sent a statement that read, "On Friday, July 14, Sen. John McCain underwent a procedure to remove a blood clot from above his left eye at Mayo Clinic Hospital in Phoenix. Subsequent tissue pathology revealed that a primary brain tumor known as glioblastoma was associated with the blood clot. Scanning done since the procedure (a minimally invasive craniotomy with an eyebrow incision) shows that the tissue of concern was completely resected by imaging criteria. The senator and his family are reviewing further treatment options with his Mayo Clinic care team. Treatment options include a combination of chemotherapy and radiation. The Senator&#8217;s doctors say he is recovering from his surgery &#8216;amazingly well&#8217; and his underlying health is excellent."</p> 
<p>The statement continued, "Senator McCain appreciates the outpouring of support he has received over the last few days. He is in good spirits as he continues to recover at home with his family in Arizona. He is grateful to the doctors and staff at Mayo Clinic for their outstanding care, and is confident that any future treatment will be effective. Further consultations with Senator McCain&#8217;s Mayo Clinic care team will indicate when he will return to the United States Senate."</p> 
<p>His daughter, Meghan McCain, tweeted out a message, "The news of my father's illness has affected every one of us in the McCain family. My grandmother, mother, brothers, sister and I have all endured the shock of the news, and now we live with the anxiety about what comes next."</p> 
<p>John McCain's wife Cindy posted a message on Instagram reading: "Thank all of you for the wonderful thoughts. @senjohnmccain is doing well. We as a family will face the next hurdle together. One thing I do know is he is the toughest person I know. He is my hero and I love him with all my heart."</p> 
<p>McCain was the GOP's presidential nominee in 2008. A Navy pilot, he was shot down over Vietnam and held as a prisoner for 5 &#189; years.</p> 
<p>The Associated Press has contributed to this report.</p>
Sen. John McCain diagnosed with brain cancer