9/17: FDA to vote on COVID booster shots. Capitol on alert. Texas border surge.

An FDA advisory committee plans to vote today on whether Pfizer's booster shot is safe and effective. Most experts believe the new doses are safe, but there's some disagreement over whether they're necessary for all Americans. Security is tight in Washington this morning ahead of a highly anticipated rally. Temporary fencing is up again around the U.S. Capitol, and the National Guard is on standby. There's a new crisis on our southern border, where officials already are apprehending what may be the largest number of migrants we've seen in two decades. A prominent South Carolina lawyer, accused of plotting what was meant to be his own death, is back in drug rehab after a court appearance. Newly-released video shows what looks like the aftermath of an argument between Gabby Petito and Brian Laundrie.

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