Conservative MPs from the West Briton area will vote in favour of a referendum on Europe to be held in 2017.
Sarah Newton, MP for Truro and Falmouth and the deputy chairman of the Conservative party said she was “acting on popular demand” in voting for an in-out referendum.
George Eustice, MP for Camborne and Redruth and a former UK Independence Party (UKIP)member, confirmed he was also voting to support the Private Members Bill introduced by James Wharton MP that is being heard this afternoon.
The legislation, backed by the Conservative leadership but not the Liberal Democrats, calls for a referendum by the end of 2017, after the next general election in 2015.
Mr Wharton's fellow Conservative, Adam Afriyie, has proposed an amendment calling for the referendum in October next year instead.
Mr Afriyie has argued that delaying a vote for four years will play into the hands of UKIP.
Mrs Newton said: "This Bill would give the British people the chance to pass a verdict on these efforts, deciding whether a reformed EU settlement would work for Britain or whether it is now time to leave the Union. I am proud to be voting in favour of the Bill today, of letting Britain decide."
The West Briton has not yet heard from Andrew George, MP for West Cornwall, on how he plans to vote this afternoon.