Here are the latest updates:

David Cameron asks MPs to back deal: 'If we can't secure these changes I rule nothing out'

PM hints that leaving the EU could threaten border agreement with Calais

Jeremy Corbyn agrees staying in the EU in 'best interests' of UK

But Labour leader brands renegotiation a 'Tory Party drama'

Corbyn says deal is 'tinkering round edges' of EU issues

Jacob Rees-Mogg leads attack from Cameron's own backbenches

The MP says 'the thin gruel has been further watered down'

Critics say deal falls short of what PM has promised

Rivals release letter opposing June referendum

9 key passages in the deal - and what they really mean

Mr Cameron was criticised on Tuesday by Labour leader Jeremy Corbyn for not coming to answer an urgent question in the House of Commons.

The PM instead held a speech on the package in Chippenham, where he said that he believed "hand on heart" that he had secured the package of reforms promised in his manifesto.

The proposals put forward by the European Union however only allow the UK to reduce in-work benefits for EU migrants over a four year period, rather than block them altogether.

The Conservative 2015 general election manifesto had in fact said migrants would have to work for four years before they were able or allowed to claim benefits.