Ed Miliband has promised his party will look into any new evidence regarding allegations of vote-rigging in Falkirk, but refused to comment on whether the inquiry would be reopened.
The Labour leader admitted there were "machine politics" at play in Falkirk, but insisted his party are "learning the lessons" from the scandal.
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The Prime Minister said Parliament will be given a binding vote on the final deal, but said the result will not stop Britain leaving the EU.
Officials from the train drivers' union Aslef will meet managers from Southern Railway, whilst the RMT will meet separately with Acas.
Last week the organisation wrote on Twitter: "If Obama grants Manning clemency Assange will agree to US extradition".