Pressure is building on the Coalition to allow a conscience vote on same-sex marriage, with Malcolm Turnbull telling a voter he supports such a move despite Tony Abbott’s opposition to it.

In an email sent to a constituent just days after Julia Gillard announced her plan to allow her party a conscience vote on the issue, Mr Turnbull said it was an “appropriate” course of action.

It comes as several Coalition MPs have spoken out in support of a vote on same-sex marriage, with Nationals leader Barnaby Joyce saying he did not have a problem with a vote and Liberal senator Simon Birmingham also backing such a move.

The Opposition Leader has declined to grant a conscience vote, saying there are not enough MPs supporting same-sex marriage to warrant a change.

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