Nigel Farage has accused his political opponents and the press of running "the most negative general election campaign ever" following a series of claims about the party's candidates.
The comments to ITV News follow the defection of MEP Amjad Bashir to the Conservatives and a video released by Labour showing his party's general secretary attacking the NHS.
Ukip MEP Amjad Bashir, who was suspended by the party for "extremely serious" issues, has defected to the Conservatives.
Prime Minister David Cameron told the Telegraph he was "absolutely delighted" at the Yorkshire and Humber MEP's decision.
News of the defection emerged shortly after Ukip suspended the MEP, who was the party's communities spokesman, over allegations including "unanswered financial and employment questions".
A senior Conservative source dismissed the move as a "desperate attempt" to play down the impact of Mr Bashir's decision.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.