The Obama administration is facing a new fight with Congress over Iran sanctions just days before the nuclear agreement signed last year is due to go into effect. The House of Representatives will vote on Wednesday on a bill that would prevent the administration from lifting sanctions under the nuclear deal for any Iranian bank with known ties to terrorist groups or the country’s ballistic missile programme. The White House has threatened to veto the bill, arguing that it would scupper the nuclear agreement with Iran, and Democratic leaders in Congress have said they will also vote against the proposed legislation, which allow the president to exercise a veto. However leading Democrats have also publicly criticised the White House for not doing more to counter Iran over recent tests of ballistic missiles and some have proposed their own sanctions legislation which they say would put pressure on Iran while staying within the bounds of the nuclear agreement.