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ARLINGTON, VA - JUNE 16:  Republican presidential candidate Sen. John McCain (R-AZ) listens to a question during a press conference June 16, 2008 in Arlington, Virginia. McCain commented on national energy policy, Iraq, and the prospect of town hall meetings with Democratic presidential candidate Barack Obama during his remarks.  (Photo by Win McNamee/Getty Images)
ARLINGTON, VA - JUNE 16:  Republican presidential candidate Sen. John McCain (R-AZ) listens to a question during a press conference June 16, 2008 in Arlington, Virginia. McCain commented on national energy policy, Iraq, and the prospect of town hall meetings with Democratic presidential candidate Barack Obama during his remarks.  (Photo by Win McNamee/Getty Images)

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CNN's Dr. Sanjay Gupta talks about the treatment options that may be available for Sen. John McCain who is now diagnosed with brain cancer.

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CNN's Dr. Sanjay Gupta talks about the treatment options that may be available for Sen. John McCain who is now diagnosed with brain cancer.