A prominent Leave campaigner is considering launching a legal challenge after the government extended the EU referendum voter registration deadline.

Leave.EU founder Arron Banks said there were grounds for a judicial review of the "unconstitutional" move.

BBC political correspondent Ross Hawkins said many Leave campaigners see the deadline extension as a "fix" because they think people signing up late will be younger and therefore more likely to support the EU.

The official leave campaign - Vote Leave, in which Mr Banks plays no part - has said the government is trying to register as many likely Remain voters as possible, but stopped short of suggesting that it would consult lawyers.