> Beyond these constraints, the Clause raises several vexing questions. For instance, must the President enforce those laws she believes are unconstitutional? Some scholars argue that Presidents must enforce all congressional laws, without regard to his or her own constitutional opinions. Yet modern Presidents occasionally exercise a power to ignore such enactments on the grounds they are not true “laws” subject to the faithful execution duty. In so doing, they somewhat mimic the arguments and practice of President Thomas Jefferson, who refused to enforce the Sedition Act on the grounds that it was unconstitutional.

https://constitutioncenter.org/the-constitution/articles/art...