"I found Todd Akin’s comments about rape victims outrageous and way over the line. He needs to apologize," Brown tweeted on Monday morning.

Brown and others, including Montana Republican Denny Rehberg, have begun to distance themselves from the congressman's comments. In an interview released on Sunday, Akin said that, in cases of "legitimate rape," "the female body has ways to try to shut that whole thing down."

The furor surrounding the comments from both parties has caused some Republicans to wonder whether the Missouri GOP needs to replace Akin to remain competitive in the race.