European Parliament election candidate Ann Widdecombe addresses a Brexit Party campaign event for the upcoming European Parliament election in London, Britain on May 21, 2019. (Photos: Xinhua)

Brexit Party leader Nigel Farage addresses a Brexit Party campaign event for the upcoming European Parliament election in London, Britain on May 21, 2019.

Brexit Party Chairman Richard Tice addresses a Brexit Party campaign event for the upcoming European Parliament election in London, Britain on May 21, 2019.

People attend a Brexit Party campaign event for the upcoming European Parliament election in London, Britain on May 21, 2019.

People attend a Brexit Party campaign event for the upcoming European Parliament election in London, Britain on May 21, 2019.

Brexit Party leader Nigel Farage addresses a Brexit Party campaign event for the upcoming European Parliament election in London, Britain on May 21, 2019. (Xinhua/Han Yan)