A referendum on the final Brexit deal agreed between the United Kingdom and the European Union - and one of the options on the ballot paper would be to stay in the EU.
The party is proposing a second referendum, "to give the people the final say" at the end of the two-year negotiating process.
The Lib Dem unveiled their plan ahead of the June 8 general election.
While the party's response to Brexit remains at the heart of the manifesto, additional policies include legalising cannabis and opposing state surveillance.
The 33-year-old said that the Liberal Democrats were now the opposition to the Conservative Party in Gloucestershire after its relatively strong showing compared to Labour in the county council elections earlier this month.
Mr Farron said the drug was a "gateway to harder drugs", and "if you brick up that gateway by making sure that people who are buying cannabis are only buying it from a regulated source then you take away the option to go into harder drugs".
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"In the biggest fight for the future of our country in a generation, Jeremy Corbyn's Labour has let you down by voting with Theresa May on Brexit - not against her".
That they will be safer and better off.
"This election is about your choice over your future". And if you don't like the deal you should be able to reject it and choose to remain in Europe.
The party plans to fund its proposals by implementing an immediate 1p rise on basic, higher and additional rates of income tax to raise £6bn in additional revenue, which would be ringfenced exclusively for expenditure on the NHS and social care services. It also endorses the Conservatives' policy on banning lettings fees for tenants and calls for the capping of up-front deposits and increasing (but unspecified) standards in rented homes.
"It is good to see Liberal Democrats living up to their values to defend rights, promote justice and equality with a firm manifesto commitment on this issue in contrast to other parties".
The Lib Dems' penny on income tax would fund a £6.3 billion boost in spending on NHS and social care.
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Pensions in the higher rate tax band will no longer be entitled to a winter fuel payment under Liberal Democrat plans, but all pensioners will keep their free bus passes.
Farage is the former leader of the U.K. Independence Party and was one of the most prominent faces of the Leave campaign. "To be clear, Theresa May's Conservative Party is on course to win this election", possibly in a "landslide", Tim Farron wrote in the manifesto.
While the Lib Dems have offered no specific mentions of which supports would be restored, solar and onshore wind could feasibly be allowed to compete in future Contracts for Difference auctions under the proposals, allowing the technology to be developed in "appropriate locations" as the manifesto suggests.
Surveys put support for the Liberal Democrats on about 10 per cent, some way behind May's Conservative Party which polls indicate is attracting support from more than 45 per cent of Britons with Labour on about 30 per cent.
The party said it would raise most of its funding through tax increases - but would initially have to borrow extra cash to meet spending needs. Where the Liberal Democrats are fighting every step of the way, Labour is holding Theresa May's hand as she jumps off the cliff edge of a hard Brexit.
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