Labour has always been clear that it respects the result of the referendum. "What we do not respect is the way the Conservatives have sought to use Brexit to create a more unequal economy and a harsher society".
Widdecombe was earlier rumoured to be considering leaving the party after she campaigned hard for Brexit and was appalled by the failure to deliver on the Article 50 commitment to leave on March 29.
"If such a plan can not be secured due to the Government's infighting and irresponsibility, we believe all options should remain on the table, including the option of a public vote".
"I thought this was a spoof account when I read this on my friend Andrew Adonis' page but then I remembered he is now standing for UK Labour in the European elections and so has been gagged by the leadership", said Mr Umunna, who quit Labour in February.
He had previously told LBC: "If you are a Brexiteer, I hope you won't vote for the Labour party, because they're moving increasingly against Brexit".
And Boris Johnson's sister Rachel was unveiled on Tuesday as a candidate in the South West for Change UK, the pro-Remain party set up by the Independent Group of MPs whose members include Chukka Umuna and Anna Soubry.
Hunt said foreign ministers of other countries were anxious about the paralysis in Britain over the way forward on Brexit, and that it would be a "big mistake" to hold a national election before Britain has left the EU. "Whatever your views on the European Union, we need to #FreeAndrew #TheAdonisOne", he tweeted.
Among those standing for Labour is Lord Andrew Adonis, the former adviser to the Blair government whose daily barrages of anti-Brexit tweets have led him to be dubbed a "caveman" by Jacob Rees-Mogg and a "twisted weasel" by Nigel Farage.
Adonis will face a number of high-profile candidates for other parties in the south-west region, where he is second on the Labour list behind the sitting MEP Clare Moody.