European countries would be kicked out of a programme for visa-free travel to the US if they did not share counterterrorism intelligence with the US under legislation introduced in the wake of the Paris terrorist attacks.
The killing of 130 people by jihadis including French and Belgian nationals has sparked US alarm about the possibility of European fighters who have been to Syria gaining access to the US under a popular visa waiver programme.
With pressure growing for tighter border controls, Republicans on Thursday introduced legislation that would demand more information from countries in the programme and toughen entry requirements for individual travellers.
Any plans to make it harder for European Union citizens to travel to the US would be met with dismay in Brussels, where sensitivity to the reciprocity of entry requirements is high.
The European Commission is already frustrated that while Americans enjoy visa-free travel in the EU, citizens of some eastern European countries — including Poland — have to apply for a permit before travelling to the US.
The visa waiver programme, which lets visitors stay up to 90 days following limited security checks, covers 30 European countries as well as Australia, New Zealand, Japan, South Korea, Taiwan, Singapore, Brunei and Chile.