You hear them say it almost every day: “As President on day one I’ll repeal Obamacare” or “When I’m President I’ll cut Planned Parenthood’s funding on day one” or “On day one I’ll have Nancy Pelosi abducted and dumped in the ocean”.
But can they really do that stuff? Well, no, according to this article:
For all candidates, it is important to note that an executive order cannot overrule a law passed by the Senate and House and signed by a former president. Therefore, though a candidate may want to abolish the Affordable Care Act with the stroke of a pen, it would take a full-fledged bill to do that.