President Joe Biden delivers remarks at South Carolina's First in the Nation Dinner at the State Fairgrounds in Columbia, South Carolina, on January 27, 2024.

A version of this story appeared in CNN’s What Matters newsletter. To get it in your inbox, sign up for free here.

CNN  — 

President Joe Biden’s evolution on the key election issue of immigration entered a new phase when he promised to “shut down the border right now” if given new powers by Congress.