Senate Majority Leader Mitch McConnell said on Tuesday he wants to pass a “sensible” bipartisan bill giving Congress the right to review an international nuclear agreement with Iran but made clear he expects lawmakers to introduce a wide variety of amendments to the legislation.

“I still expect to see a vigorous debate this week. I still expect to see a robust amendment process,” McConnell said in a Senate speech before debate on the bill began on Tuesday.

The Senate Foreign Relations Committee voted 19-0 last week for a compromise version of the Iran Nuclear Review Act in a rare display of bipartisan unity in the deeply divided Congress.

But some U.S. Republicans have introduced amendments seeking to toughen the bill, raising the possibility of a partisan battle that could complicate the measure’s chances of passing. Many Republicans worry that Democratic President Barack Obama is so eager to reach a nuclear agreement with Iran that he will allow the Tehran government to develop a nuclear weapon.

Before the compromise, Obama had threatened to veto the bill, saying that some of its provisions threatened delicate international negotiations with Iran.

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