Washington (CNN) Sen. John McCain called on the Senate to reject Gina Haspel's nomination to be the director of the CIA, citing her refusal in testimony on Wednesday to acknowledge "torture's immorality."

"I believe Gina Haspel is a patriot who loves our country and has devoted her professional life to its service and defense," the Arizona Republican said in a statement Wednesday evening.

"However, Ms. Haspel's role in overseeing the use of torture by Americans is disturbing. Her refusal to acknowledge torture's immorality is disqualifying. I believe the Senate should exercise its duty of advice and consent and reject this nomination," his statement continued.

McCain serves as the chairman of the Senate Armed Services Committee, but is currently in Arizona, where he is being treated for brain cancer and is not expected to be present for the vote on Haspel's nomination.

Haspel was tapped by President Donald Trump to take the place of now-Secretary of State Mike Pompeo, who had been heading the CIA prior to the departure of former Secretary of State Rex Tillerson.

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