Sen. Claire McCaskill Announces She Has Breast Cancer

<a href=>Tom Williams</a>/AP

Sen. Claire McCaskill (D-Mo.) announced on Monday afternoon that she has been diagnosed with breast cancer.

McCaskill, who delivered the news on her Tumblr account, explained that she will be receiving treatment in St. Louis over the course of the next three weeks, and will enter into official congressional record the votes she would have cast during her absence.