"I do not believe that a claim of sexual assault is invalid because a 15-year-old girl didn’t promptly report the assault to the authorities, as the president of the United States said just two days ago," Flake said.

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Flake questioned what sort of message Trump's rhetoric has on young woman and how often politicians would "marginalize and ignore woman."

"How uninformed and uncaring do you have to be to say things like that, much less believe them? Do we have any idea what kind of message that sends, especially to young women? How many times do we have to marginalize and ignore women before we learn that important lesson?" Flake asked.

Trump late last week week questioned why Christine Blasey Ford, the woman accusing Kavanaugh of sexual assault, didn't report the alleged incident at the time.

"You say, why didn't somebody call the FBI 36 years ago? ... I mean, you could also say, when did this all happen? What's going on?" Trump told Fox News's Sean Hannity.