The concept of the IDSA/ESA arose from the controversies that the violence depicted in the video game "Mortal Kombat" drew. This led to a United States Congress hearing in late 1993 where the video game industry was put under scrutiny for the level of violence in games like "Mortal Kombat" and "Night Trap". During these hearings, Sega and Nintendo blamed the other for the situation, citing differences in how they would rate the content of games for players. Following the hearings, Congressman Joe Lieberman proposed the Video Game Ratings Act of 1994, which would have set a government-overseen commission to establish a ratings system for video games, and threatened to push it through legislation if the video game industry did not voluntarily come up with one of its own. Recognizing the threat of government oversight, the companies decided to establish the IDSA to be a unified front and represent all video game companies at this level, and subsequently developed the Entertainment Software Ratings Board (ESRB) to create a voluntary but standardized rating approach to video games. In July 1994, IDSA representatives returned to Congress to present the ESRB, which Congress accepted and became the standard for the American industry.