The back and forth between Democrats and Republicans over Supreme Court nominee Judge Brett Kavanaugh continued this week, as both sides prepare for a final confirmation vote on Saturday evening. The U.S. agrees to a new trade deal with Mexico and Canada. Suspicious letters with traces of ricin are sent to the Pentagon and White House. Plus -- a police shooting in South Carolina devastates a community. CBS News Correspondent Steve Dorsey will have these stories and more on the CBS News Weekend Roundup.