Sen. Claire McCaskill, D-Mo., speaks during a hearing on Capitol Hill in Washington, earlier this week. McCaskill, who is facing re-election in a heavily Republican state, says she will vote to not confirm Judge Brett Kavanaugh to the Supreme Court.

Sen. Claire McCaskill, D-Mo., speaks during a hearing on Capitol Hill in Washington, earlier this week. McCaskill, who is facing re-election in a heavily Republican state, says she will vote to not confirm Judge Brett Kavanaugh to the Supreme Court.