Without a Supreme Court to interpret the Constitution and determine whether laws are constitutional, there would be a significant risk of the President and Congress abusing their power to create laws that violate the Constitution. This could lead to a constitutional crisis, where the government is unable to agree on the interpretation of the Constitution and the laws created by the government are in direct conflict with the Constitution. This could lead to an erosion of civil liberties and a weakening of the rule of law, as the President and Congress would be able to pass laws without any judicial review.