What is going on inside UKIP over leadership contest?

There are tensions inside UKIP after leadership hopeful Steven Woolfe was ruled "ineligible" to stand in the contest to replace Nigel Farage.

The party's biggest donor Arron Banks has said there is a "semi-coup" going on in the party, and it may break up entirely if it continues on the same course.

Professor Matthew Goodwin of Kent University tells the Today programme what is going on inside the party.