PM meets French president in Paris, insisting Brexit impasse can be broken "with energy and creativity".
The UK has no system to work out who is legally in the country after a no-deal Brexit, experts say.
Channel 4's Dorothy Byrne says journalists must say when a politician is not telling the truth.
It will look at the costs and benefits, with a “go or no-go" decision by the end of the year.
The minister in charge of no-deal planning again dismisses predictions of chaos at the ports.