The quote emphasizes the potential consequences of Democrats employing aggressive strategies to undermine or remove President Trump. While they may achieve short-term success, such actions could backfire and damage the fundamental principles of democracy. It suggests that winning through such means could lead to a weakened political landscape devoid of essential safeguards.
In this context, the term "Pyrrhic victory" highlights the idea that the cost of winning might outweigh the benefits. If Democrats were to succeed, they might find themselves governing in a democracy that has lost crucial protections, leading to an unstable political environment that could threaten future governance and civil liberties.