In a letter to the prime minister, deputy leader Ed Davey said “the public deserve to know” the terms of any agreement made with senior figures in The Brexit Party ahead of the general election.
Mr Davey also claimed that the Lib Dems were the “main challengers to the Tories” in many of the affected constituencies.
Outlining three key questions, he first asked Mr Johnson to confirm “whether Nigel Farage or any Brexit Party candidate or official was offered a peerage or an official appointment for allying with the Conservatives during this general election.”
He then urged the prime minister to confirm whether the Brexit Party leader – a friend of Donald Trump – was offered the role of British ambassador to the US.
Trump and Farage - a working friendship
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Trump and Farage - a working friendship
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Donald Trump and Nigel Farage pose in the golden elevator at Trump Tower on 12 November 2016, four days after Trump was elected president. Farage was the first British politician to meet with Trump after the election
LeaveEUOffical/Twitter
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Not long after their meeting at Trump Tower, then-president elect Trump tweeted in favour of Nigel Farage being appointed ambassador to the US
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Farage appears at a Trump campaign rally in Jackson, Mississipi on 24 August 2016. Farage drew parallels between the recent vote for Brexit in the UK and a vote for Trump in the US, saying "they could take back control of their country, take back control of their borders and get back their pride and self-respect"
Getty Images
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Trump introduced Farage as "Mr. Brexit"
Getty Images
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President Trump with Nigel Farage when they met met face-to-face to discuss why the President should back a no-deal Brexit on 3 March 2019
PA
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From left to right: Gerry Gunster (US pollster and campaign adviser to Leave.EU), Arron Banks (Leave.EU founder who is being investigated over the funding of the Brexit campaign), Donald Trump (then president-elect), Nigel Farage (then leader of UKIP), Andy Wigmore (communication director of Leave.EU) and Raheem Kassam (then-advisor to Farage and later UK editor of Breitbart news)
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Farage and his adviser Raheem Kassam arrive to meet with Trump on November 12 2016
Getty Images
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Donald Trump and Nigel Farage pose in the golden elevator at Trump Tower on 12 November 2016, four days after Trump was elected president. Farage was the first British politician to meet with Trump after the election
LeaveEUOffical/Twitter
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Not long after their meeting at Trump Tower, then-president elect Trump tweeted in favour of Nigel Farage being appointed ambassador to the US
3/7
Farage appears at a Trump campaign rally in Jackson, Mississipi on 24 August 2016. Farage drew parallels between the recent vote for Brexit in the UK and a vote for Trump in the US, saying "they could take back control of their country, take back control of their borders and get back their pride and self-respect"
Getty Images
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Trump introduced Farage as "Mr. Brexit"
Getty Images
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President Trump with Nigel Farage when they met met face-to-face to discuss why the President should back a no-deal Brexit on 3 March 2019
PA
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From left to right: Gerry Gunster (US pollster and campaign adviser to Leave.EU), Arron Banks (Leave.EU founder who is being investigated over the funding of the Brexit campaign), Donald Trump (then president-elect), Nigel Farage (then leader of UKIP), Andy Wigmore (communication director of Leave.EU) and Raheem Kassam (then-advisor to Farage and later UK editor of Breitbart news)
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Farage and his adviser Raheem Kassam arrive to meet with Trump on November 12 2016
Getty Images
“Such a move would be of grave concern given the subsequent increased threat of a post-Brexit UK-US trade deal that would undermine our NHS, farmers and other businesses,” Mr Davey said.
His third and final question to Mr Johnson requested confirmation on whether he or his party had taken legal advice on the Honours (Prevention of Abuss) Act of 1925, which banned the sale of peerages.
The Liberal Democrats have also called on the Conservatives to launch an independent internal enquiry into allegations officials offered jobs and peerages to Brexit Party candidates in return for standing aside.
Sal Brinton, the party’s president and a member of the House of Lords, said: “The severity of these claims has implications not just for the integrity of the General Election, but also for the public’s trust in our democracy.”
Mr Johnson has admitted there were “conversations” between senior Tories and the Brexit Party but denied that peerages were offered, saying it was “just not the way we operate”.
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