A parade in Philadelphia, one of the largest in its history, was canceled on Friday, and the Great American State Fair on the National Mall in Washington closed for several hours.

The president has sent 260 F.B.I. analysts to Georgia, repeating his baseless claims of fraud in 2020. But critics say the intention is to undermine overall confidence in the electoral process.

The Social Security Administration will introduce a process to sign up babies for the investment program at the same time they are registered for a Social Security number.