John McCain John McCain

Senator John McCain leaves after a procedural vote on healthcare on Thursday, as the Senate was to vote on moving head on health care with the goal of erasing much of Barack Obama's law. Brendan Smialowski/AFP/Getty Images hide caption

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Brendan Smialowski/AFP/Getty Images

Glioblastomas are the most common malignant brain tumor. About 12,000 people in the U.S. are diagnosed with the cancer every year. Sherbrooke Connectivity Imaging Lab/Science Source hide caption

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Sherbrooke Connectivity Imaging Lab/Science Source

John McCain Was Diagnosed With A Glioblastoma, Among The Deadliest Of Cancers

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Sen. John McCain, R-Ariz., has been critical of how the GOP health overhaul bill would affect people in his state. Anadolu Agency/Getty Images hide caption

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Anadolu Agency/Getty Images

Neurosurgeon: McCain's Recovery From Brain Surgery Might Take Weeks

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Sen. John McCain, R-Ariz., speaks during the Munich Security Conference last week. McCain's office has confirmed that while he was overseas, he met with U.S. forces in Syria about defeating ISIS. Matthias Schrader/AP hide caption

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Matthias Schrader/AP

Director of National Intelligence James Clapper (center) talks with National Security Agency and Cyber Command chief Adm. Michael Rogers prior to testifying before the Senate Armed Services Committee. Evan Vucci/AP hide caption

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Evan Vucci/AP

Rep. Debbie Wasserman Schultz (from left), Sen. Marco Rubio and Sen. John McCain. Gaston De Cardenas/AFP/Getty Images; Joe Raedle/Getty Images; Patrick T. Fallon/Bloomberg via Getty Images hide caption

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Gaston De Cardenas/AFP/Getty Images; Joe Raedle/Getty Images; Patrick T. Fallon/Bloomberg via Getty Images

Sen. John McCain, R-Ariz., and Sen. Marco Rubio, R-Fla., talk on Capitol Hill in 2014. Both are expected to win their primaries for re-election Tuesday. Carolyn Kaster/AP hide caption

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Carolyn Kaster/AP

Incumbents Poised For Big Wins Despite All The Attention On Outsiders

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Donald Trump gives his acceptance speech during the final day of the Republican National Convention, July 21, in Cleveland. Mark J. Terrill/AP hide caption

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Mark J. Terrill/AP

Hear A Related Story From Don Gonyea On The Campaign Trail

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President Obama slammed Republican nominee Donald Trump as "unfit" and "woefully unprepared" to be president during a news conference with Singapore's prime minister at the White House on Tuesday. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP

Former President George W. Bush (above); his father, former President George H.W. Bush; and brother Jeb Bush, who ran for president this year, will not be attending this week's Republican National Convention in Cleveland. Matt Rourke/AP hide caption

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Matt Rourke/AP

"When Mexico sends its people, they're not sending their best. ... They're bringing drugs; they're bringing crime, [bringing] their rapists. And some, I assume, are good people," Donald Trump said while announcing his campaign last month. Paul J. Richards/AFP/Getty Images hide caption

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Paul J. Richards/AFP/Getty Images

Report Reveals Deeply Misguided Interrogation Tactics, Feinstein Says

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Sen. John McCain, an Arizona Republican, at the annual meeting of the World Economic Forum in Davos earlier this week. His state's GOP leadership has censured him for his "disastrous" record. Ruben Sprich/Reuters/Landov hide caption

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Ruben Sprich/Reuters/Landov

Sen. Chuck Schumer (D-NY), left, seen here speaking with Sen. John Barrasso (R-WY) in an elevator Sunday, says that undoing the sequester cuts is "one of the sticking points" in budget talks. Congress is struggling to find a solution to end the government shutdown, now in its thirteenth day. Andrew Burton/Getty Images hide caption

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Andrew Burton/Getty Images