The bill now goes to the Senate, where critics are already preparing amendments that could upset the delicately crafted measure.
Legislatures in seven states have already approved amendments that will be put before voters this year, starting with Missouri on Aug. 3 and Louisiana on Sept. 18, according to the Human Rights Campaign, a gay rights group.
Tory backbenchers have already tabled amendments introducing automatic six-month jail sentences to the new criminal justice and courts bill for any offender caught in possession of a knife twice.
The bill is scheduled to be taken up for debate on the Senate floor next week, and certain Republicans have already drafted amendments that would make the requirement even more demanding, explicitly mandating that the 90 percent standard be achieved before the pathway to citizenship can proceed.
Republican senators have already filed amendments that the bill's sponsors warn could jeopardise a rare bipartisan measure.
Fortunately, Senators have already authored amendments to the Dodd bill that can fix the problems Obama wants solved.
The Second Amendment is already a gun-control amendment.
Minnesota and North Carolina already have constitutional amendments seeking to ban same-sex marriage on the ballot this year.
A package of constitutional amendments, already passed by the National Assembly, renames the province Khyber-Pakhtoonkhwa, a move long championed by the majority ethnic Pashtun population.
As Senate leaders worked to broker agreements that would allow for the first floor votes in the financial regulation debate, Mr. Dodd said that there were numerous amendments already put forward that could easily win bipartisan support.
