David Cameron has hailed the Newark by-election result as "very good for the Conservative Party" but he said the Tories needed to "work between now and the next election" to win back voters from Ukip, who came out second in the by-election.
The PM was speaking in Bayeux, France ahead of D-Day commemoration events.
Asked how he would win back support from Nigel Farage's party he acknowledged the challenge posed by Ukip:
"The job isn't finished yet but we are on the right track, let's stick at it."
More top news
Ben Bradley, the Conservative vice chair for youth, has backtracked after saying people who can't afford children should have vasectomies.
Donald Trump is in "excellent" physical health and performed "exceedingly well" at a cognitive test, a presidential medical has found.
Anthony Joshua would shake up the tax system and "educate" people about how to use the NHS properly if he went into politics.