Labour and the Conservatives in Britain could face more resignations, with members of the new Independent Group saying they expect more MPs to join them.
Labour Parliamentarian Ian Austin said he would think “long and hard” about his future in the party.
It comes as Labour leader Jeremy Corbyn said defecting MPs should “resign and put themselves up for election”.
Meanwhile, former attorney general Dominic Grieve said he would quit the Conservatives if there was a no-deal Brexit.
The Tory MP said he admired the courage of the 11 members of the Independent Group – eight ex-Labour MPs and three former Tory MPs – and agreed totally with their support for another EU referendum.