VERITAS MONITORING OF THE PERIODIC BLAZAR PG 1553+113 DURING FERMI-LAT PREDICTED MAXIMUMRECENT RESULTS OF THE FERMI-LAT COLLABORATION SHOW A SIGNATURE OF A PERIODIC MODULATION OF ~2 YEARS ON THE GAMMA-RAY LIGHT CURVE OF THE BLAZAR PG 1553+113. SIMILAR MODULATION WAS FOUND AT LOWER FREQUENCIES. THIS IS THE FIRST TIME THAT SUCH PERIODICITY HAS BEEN FOUND IN GAMMA-RAY EMISSION FROM A BLAZAR. SEVERAL SCENARIOS HAVE BEEN PROPOSED TO EXPLAIN THE TWO-YEAR OSCILLATION PERIOD AND MULTI-FREQUENCY MONITORING CAMPAIGNS WITH THE VHE BAND IN PARTICULAR ARE FUNDAMENTAL TO DIFFERENTIATING BETWEEN THEM. TO PROBE THE MINIMUM OF THE PERIODICITY IN VHE THE THREE MAJOR IACTS (VERITAS HESS AND MAGIC) HAVE INITIATED A JOINT OBSERVING CAMPAIGN FOR THE 2016 SEASON. THIS FERMI-VERITAS GI PROPOSAL SEEKS TO SECURE 20 HOURS OF VERITAS OBSERVING TIME FOR THE 2017 SEASON TO PROBE THE PREDICTED MAXIMUM.