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Rehberg's decision comes as Akin faces increasingly strong pressure to resign his candidacy to replace Sen. Claire McCaskillClaire McCaskillSenators introduce dueling miners bills GOP must avoid Dems' mistakes when replacing ObamaCare Live coverage: Mattis confirmation hearing for Pentagon MORE (D-Mo.) in light of comments he made about the rarity of pregnancies as a result of rape. Akin has received continued criticism over the remark and statements from top Republicans that he should consider stepping down.

Late Sunday night, in reaction to Akin's remarks, Rehberg called Akin's comments "reprehensible."

"As a pro-life conservative, a husband and a father of two young women, I find Rep. Akin's remarks to be offensive and reprehensible," Rehberg said. "There is no such thing as a 'legitimate rape.' I condemn Rep. Akin's statements in the strongest possible terms."

On Monday, Akin has said he plans to stay in the race.