Sen. John McCain's office announced Wednesday he has brain cancer. His daughter, Meghan McCain, posted a somber, but optimistic message on Twitter in light of the news.
"Cancer may afflict him in many ways: but it will not make him surrender," Meghan McCain posted in an image on Twitter. "Nothing ever has."
The tumor is a glioblastoma, a highly malignant cancerous tumor, according to the America Brain Tumor Association.
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