What is Section 4 of the 25th Amendment?

Many of Trump’s critics have been discussing the provision, which could be used to remove a president without impeachment. Once the new Congress is sworn in during the new year, Democrats could help invoke it.

As explained by Congress.gov, Section 4 covers what happens when a president can no longer carry out their duties but cannot or will not acknowledge it themselves. It was proposed in 1965 before becoming law in 1967, and has never been invoked in the almost six decades since.

Section 3, meanwhile, applies when a president voluntarily declares themselves unfit, such as ahead of a planned medical procedure.