Schumer, one of the key backers of reform, warned that any amendment requiring full border security compliance could fatally undermine the legislation.
Only UKIP's stance of leaving the EU, restoring full border controls and choosing who enters the UK before they get here is the sensible way forward.
In fact the UK operates full border controls for all entrants into the UK, irrespective of nationality or point of entry.
What the president meant was that full border controls would be established on the land frontiers with its neighbours, with passports or ID cards instituted for travel from Schengen countries by road and rail.
The Senate is nearing a vote on a measure that, while less restrictive, would still impose strict security and insurance standards on Mexican trucks and would probably delay a full border opening for years.
Beefing up the EU's asylum agency, Frontex, into a full border and coastguard agency, and working on hotspots and a list of "safe countries" whose citizens would not normally qualify for asylum, would also be up for discussion, the official said.
