<sod >Mr Trump made the announcement at the White House Tuesday, saying that he had signed a memorandum instructing the Justice Department to regulate the firearm accessories that can speed up the rate of fire for semi-automatic rifles.< eod>< sod > Mr Trump made the announcement at the White HouseÂ during a Medal of Valour award ceremony, saying that he had signed a memorandum instructing the Justice Department to regulate the firearm accessories that can speed up the rate of fire for semi-automatic rifles.< eod>