The Lib Dems' pro-EU stance helped the party gain its ninth MP in the 650-seat parliament in a December by-election, beating the eurosceptic Conservative candidate by running a strongly anti-Brexit campaign.
Elsewhere in the manifesto the Lib Dems said it wants to expand the "Financial Conduct Authority's remit to include a statutory duty to promote financial inclusion as one of its key objectives".
"I worked with residents locally to oppose plans to scrap the direct train from Seaford to London and handed over 3,000 signatures to the Prime Minister in December calling for Southern Rail to be sacked".
The Liberal Democrats have pledged to review the case for a single rate of pensions tax relief and committed to maintaining the triple lock in their election manifesto.
"And if you don't like that deal, you should have the choice to remain in the European Union", he said.
"The Conservatives have lost the right to call themselves the party of business".
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"We will not let campaigners for a hard Brexit pretend that racism and discrimination are a kind of patriotism".
The opinion polls suggest the Lib Dems will fail to make a breakthrough at the election.
Today, leader Tim Farron revealed the manifesto pledges, which included raising income tax by 1p to raise £6 billion for the health and social care sector, as well as raising £1 billion in revenue by legalising cannabis.
The party would use a Housing and Infrastructure Development Bank to help firms and housing associations fund the building of rent to own homes. Total borrowing costs would be nearly double the government's plans - £40bn in 2019-20 compared with the government's £21bn.
The Lib Dem manifesto will set out a series of policies which the party said are created to help children and young people.
They say the budget would be balanced for day-to-day spending by the following year - though the United Kingdom would still borrow cash for major one-off capital infrastructure projects.
"We want to give all our children a brighter future in a fairer Britain where people are decent to each other, with good schools and hospitals, a clean environment and an innovative economy", Farron said.
And in an appeal to voters to support the Lib Dems, he said: "Theresa May and Nigel Farage's cold, mean-spirited Britain is not the Britain I love".