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Watch Ana Navarro's touching response to John McCain's cancer diagnosis

After being diagnosed with an aggressive form of brain cancer, Arizona Sen. John McCain (R) vowed Thursday morning on Twitter that he would "be back soon" to his Senate duties in Washington, "unfortunately for my sparring partners in Congress." McCain, 80, was diagnosed with a type of tumor known as a glioblastoma after a surgery last week, his office announced Wednesday.

But in addition to his feisty Thursday morning tweet, McCain is hardly slouching on the job while he recovers from the operation — he also issued an official statement Thursday morning regarding President Trump's reported decision to end a CIA program that covertly arms moderate rebels in Syria. That relentless energy is why CNN commentator and former McCain staffer Ana Navarro has faith in McCain's recovery fight, she said on CNN on Thursday morning. "I know that if there's one word that he stands for, it's 'fight,'" Navarro said. "That guy has never given up in his life."

"I have never heard John McCain complain once," Navarro continued. "He is so much more than Sen. McCain. He is a friend, he is a mentor, he is a buddy, he is an adviser, he's a confidante. He's a critiquer — he's honest, he's blunt. He will open doors for you, and he will tell you when you're making mistakes."

Watch Navarro share her touching thoughts on her former boss below. Kimberly Alters