UKIP's new leader James quit Tuesday night after just 18 days.
Diane James takes over from Nigel Farage.
New study on politicians' impact on Brexit makes embarrassing reading for David Cameron.
Clinton's speech sought to link Donald Trump to "right-wing nationalism around the world."
He is to tell the crowd that 'I've been part of a political revolution in the United Kingdom.'
'That doesn't mean I am picking on British Islam,' the councillor said.
UKIP has been dealt a good political hand this year. Now it's up to them to capitalize on it.
Farage's departure comes at a time when unity is sorely needed in British politics.
Cameron said the U.K. should have a new leader by October.
The U.K. has voted to leave the European Union after a tumultuous campaign.
Farage has campaigned for the U.K. to leave Europe for 25 years.
The planned guestlist includes Alistair Campbell, Ulrika Jonsson, Delia Smith, Germaine Greer, Louise Mensch and over 100 more.
Campaigns have been freewheeling across social media in the run-up to Thursday's vote.
UKIP leader said his objections were focused more on "quality of life."
Protest against EU fisheries law hijacked by Remain campaigners including Sir Bob Geldof.
Tell us which side you're on.
UKIP leader also defended controversial comments about migrant sex attacks.