close Chi-Chi's CEO says 'biggest challenge' is upholding Mexican restaurant chain's legacy Michael McDermott, founder of the new Chi-Chi's Mexican restaurant in Minnesota and son of the original restaurant's co-founder, reveals to Fox News Digital the "biggest challenge" when it comes to bringing the concept back. NEW You can now listen to Fox News articles! After more than four decades of serving fajitas, queso and margaritas , On the Border Mexican Grill & Cantina has said "adios." The