US senators have unveiled a long-awaited cross-party deal that aims to combat illegal immigration at the US-Mexico border – and, in return, grant new aid to Ukraine and Israel.

The bill would introduce much more severe measures to try to stem border crossings, which are at record levels.

The influx is one of the biggest political headaches facing Joe Biden.

The Democratic-led Senate will vote on the bill this week, but a senior House Republican said the bill was doomed.