TRUMP

In 2017 the US SENATE passed new Russian sanctions for interfering with our 2016 election 98-2 (Veto Proof) . President Trump reluctantly signed it Aug 2, 2017 BUT NEVER IMPLEMENTED THEM. THIS is a constitutional violation. 

While diehard, uneducated, close minded Trump supporters feel Trump can't do wrong, nor do they believe he lies (despite fact check.org showing he lies 5.5x a day such as having Mexico pay for a big beautiful wall...) 

I use this constitutional example as solid proof. " The Executive Branch is defying the Constitution. Article II, Section 3 of the Constitution requires the President to “take Care that the Laws be faithfully executed.” This clause, known as the Take Care Clause, requires the President to enforce all constitutionally valid Acts of Congress, regardless of his own Administration’s view of their wisdom or policy. The clause imposes a duty on the President; it does not confer a discretionary power. The Take Care Clause is a limit on the Vesting Clause’s grant to the President of “the executive power.”

The end

Plenty of other constitutional examples such as violations of the emoluments clause