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