Up First briefing House impeaches Mayorkas Democrats flip George Santos seat NPR

Efforts to contain the virus are falling short. A teenager in Canada is in critical condition after an unexplained infection. And the arrival of flu season has scientists on edge.

"DACA does not confer any form of legal status in this country," said DHS assistant press secretary Tricia McLaughlin, who then encouraged "every person here illegally" to self-deport.

The ban, which revives a controversial measure from Trump's first term, took effect Monday morning. Here's what to know about who's affected, who's exempt and how foreign leaders are responding.