Every single bill that is presented to the House or Senate is referred to a committee, which then refers the bill to an subcommittee. The subcommittees hold hearings and conduct research and investigations into the bill and its details. Once the committee agrees upon it then referred back to the House for debate and passage. On the floor of the House, members who oppose the bill may try to stop the bill from being passed in a number of ways. which would discourage continued pursuit of the bill, or by adding completely unrelated and completely undesirable amendments that may force the President to veto the bill