MPs could vote again on Syria if 'circumstances change significantly', ministers say Downing Street on Monday repeatedly said there were "absolutely no plans" to take the issue back to the Commons following Mr Cameron's defeat last week. However, Westminster insiders believe that the Government is leaving the door open to another vote following President Barack Obama's decision to delay military strikes against Assad and seek the support of the US Congress. Speaking in the Commons on Monday, Mr Hammond said: "I've said already we believe Parliament has spoken clearly on this issue and is unlikely to want to revisit it unless the circumstances change very significantly." MPs last Thursday rejected Government backing for potential military action against Syria by just 13 votes. Former Tory Cabinet ministers have now joined the list of senior figures in the party urging Mr Cameron not to entirely rule out a second vote it the Commons. Mr Fox said: "Before a second vote could happen I think two things would need to change - the first is that more information and new information would have to be available to Members of Parliament. The second would be that the Labour Party leadership would have to change from being parliamentary tacticians to thinking about Britain's place in the world. Is there ground on either of those for another vote? I think yes on both. Mr Mitchell added that it was important that the Government "don't rule anything out." "There's very rapidly moving situation, we've had new intelligence even since the vote on Thursday," he said. Boris Johnson, the Mayor of London, has also argued that there should be another debate in Parliament about Syria. Chuka Umunna, the Shadow Defence Secretary, and Mr Murphy on Monday appeared to welcome the possibility of a second vote. In the Commons on Monday Mr Murphy asked Mr Hammond to "spell out" how the circumstances would have to change for the Government to seek a fresh mandate in Parliament. That prompted an angry response for Mr Hammond, who said it was a "bit rich" for Labour to demand a timetable for a new vote after "trooping into the lobbies" behind Ed Miliband to ensure that the Government's motion was not passed. Labour sources on Monday night said their position is "unchanged." "The use of force by the UK has been ruled out by the Government," a source said. The Prime Minister made clear immediately after the vote that the UK will not take part in military action in Syria. Nick Clegg, the Deputy Prime Minister, has said that he "can't foresee any circumstances" in which MPs could vote again on action in Syria. Mr Hammond also dismissed Labour criticism following the disclosure of a chemicals trade deal with Syria signed months after the bloodshed started in the country. He said that the business department issued licences for the export of sodium fluoride and potassium fluoride to the war-torn country in January last year before revoking them several months later. It came as a poll by ComRes for ITV News showed that nearly 60 per cent of Britons believe that Mr Cameron was "reckless" to propose military action without knowing if he had the support of Parliament. An ICM poll for the BBC meanwhile found that 71 per cent of voters thought MPs were right to stop the Government participating in a military response. In a further development Jesse Norman, a member of Mr Cameron's Downing Street policy unit who failed to back the Government in the Commons, suggested that intelligence was released too late and that some MPs did not trust it. In an article for the Conservative Home website, Mr Norman, whose job is thought to be under threat, drew parallels to the build-up to the Iraq war. "The present Government would never stoop to the depths plumbed in 2002-3," he wrote. But is it any wonder that the British people, and British parliamentarians, have found themselves pausing at the last-minute publication of excerpts from intelligence sources, including the JIC [Joint Intelligence Committee]?