US Rep. Adriano Espaillat’s campaign has slapped a super PAC bankrolling a trio of far-left congressional candidates with a “cease and desist” letter demanding it halt a “false” ad campaign that “misrepresents” the five-term congressman’s record, The Post has learned. Stanley K. Schlein, the congressman’s campaign lawyer, fired off a letter to reps of American Priority PAC threatening a lawsuit unless it pulls a recent TV ad containing “factual inaccuracies” about Espaillat’s record on Capitol