9/21: WH Press Sec. Jen Psaki previews Pres. Biden’s first UN speech as president. New details in the Gabby Petito case.

CBS Mornings on the Go

President Biden faces an important test this morning on a worldwide stage. The Biden administration also faces questions over troubling new images from the southern border. White House Press Secretary Jen Psaki joins us ahead of President Biden's first UN General Assembly address as president. Johnson & Johnson says new studies confirm its single-shot vaccine provides strong protection against serious illness and death, even after six months. Two teenagers shot at a Virginia high school are recovering, and the school is closed this morning. We're learning about a possible timeline in the case of Gabby Petito, who vanished during a cross-country trip with her fiancé.

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