Read Meghan McCain’s statement about her father’s brain cancer

WASHINGTON, DC - Meghan McCain and Senator John McCain attend the 100th Annual White House Correspondents' Association Dinner at the Washington Hilton on May 3, 2014 in Washington, DC.  (Photo by Dimitrios Kambouris/Getty Images)

Credit: Dimitrios Kambouris

Credit: Dimitrios Kambouris

WASHINGTON, DC - Meghan McCain and Senator John McCain attend the 100th Annual White House Correspondents' Association Dinner at the Washington Hilton on May 3, 2014 in Washington, DC. (Photo by Dimitrios Kambouris/Getty Images)

Meghan McCain, the daughter of Sen. John McCain, (R-Arizona), posted a statement about her father’s diagnosis of brain cancer Wednesday, saying the man who survived a Vietnamese prisoner of war camp is "the toughest person I know.”

McCain said that while her family is struggling with the diagnosis of glioblastoma – an aggressive form of brain cancer – her father will not surrender to the disease.

Here is the tweet Meghan McCain posted.

“The news of father's illness has affected every one of us in the McCain family. My grandmother, mother, brothers, sister, and I have all endured the shock of the news, and now we live with the anxiety about what comes next. It is an experience familiar to us, given my father's previous battle with cancer — and it is familiar to the countless American families whose loved ones are also stricken with the tragedy of disease and the inevitability of age. If we could ask anything of anyone now, it would be the prayers of those of you who understand this all too well. We would be so grateful for them.

It won't surprise you to learn that in all this the one of us who is most confident and calm is my father. He is the toughest person I know. The cruelest enemy could not break him. The aggressions of political life could not bend him. So he is meeting this challenge as he has every other. Cancer may afflict him in many ways: but it will not make him surrender. Nothing ever has.

My love for my father is boundless, and like any daughter I cannot and do wish to be in a world without him. I have faith that those days remain far away. Yet even in this moment, my fears for him are overwhelmed by one thing above all: gratitude for our years together, and the years still to come. He is a warrior at dusk, one of the greatest Americans of our age, and the worthy heir to his father's and grandfather's name. But to me he is something more. He is my strength, my example, my refuge, my confidante, my teacher, my rock, my hero — my dad.”

Meghan McCain is a Fox News host and contributor.