What are three hurdles congress faces in passing bill?

A bill is a proposed law that is introduced to Congress by a member of the house or senate and it is assigned to a committee which is then assigned to a subcommittee. After the subcommittee performs studies, holds hearings, makes revisions, and approves it, the bill goes to the full committee. Full committee may amend or rewrite the bill, before deciding whether to send it to

the floor of the House or Senate or to kill it. If approved, the bill is reported to the full House/Senate and placed on the calendar. In the House, the rules committee issues a rule governing debate on the House floor and sends the bill to the full house. In the senate, leaders of both parties schedule debate on the bill. The bill is then debated by full House/Senate, amendments are offered and a vote is taken. If the bill passes in a different version from that passed in the Senate or House, it is sent to a conference committee. The conference committee composed of members of both house and senate meet to iron out differences between the bills. The compromise bill is returned to both the house and senate for a vote. Full House/Senate votes on conference committee version. If it passes, the bill is sent to the president. The President signs or vetoes the bill. Congress may override a veto by a two-thirds vote in both the House and Senate. Then it's a LAW!

from Government in America

George C. Edwards, Martin P Wattenberg, and Robert L Lineberry