President Donald Trump loves to take a phrase and drain it of all meaning. In his first term, he transformed the term "fake news" from describing a specific problem with a type of misinformation into an attack on any journalist he didn't like or a piece of journalism that made him look bad. Now he's doing the same to the word "lawfare," and the stakes are even higher — including, potentially, the guardrails of our democracy. Coined in 2001, "lawfare" refers to the use of courts and other legal systems to damage or delegitimize a political opponent. After Trump left...