The Liberal Democrats have pledged to extend paternity leave from two to six weeks, under manifesto plans unveiled today.
It means parental leave would be extended to 58 weeks in total.
The new policy goes further than the Government's introduction of shared parental leave, which means mothers and fathers can split an entitlement of 52 weeks between them.
A parent taking up to 26 weeks off is then entitled to return to the job they were working in before their child's birth.
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Former Work and Pensions Secretary Iain Duncan Smith has David Cameron should remain prime minister even if Britain votes to leave the EU.
Tony Blair has said Leave campaigners are focusing on immigration "because they've lost comprehensively the debate on the economy".