A new opinion poll shows support for the abolition of the Seanad is continuing to fall leaving the Government facing a tough campaign if its referendum is to be carried.

Tomorrow's Sunday Independent/Millward Brown poll shows 37% of respondents favour abolition of the Seanad, a drop of six points since the last poll in June.

33% favour reform of the Seanad, a rise of three points, while 7% favour retaining the Seanad as it is. 23% of respondents expressed no opinion.

The poll also confirms that Fine Gael, up three points to 29% support, has not been damaged by internal difficulties over the passing of the Protection of Life During Pregnancy legislation.

Support for the Labour Party remains unchanged at 8% but is still considerably down on the party's general election result in 2011.

Fianna Fáil is down one point to 28%, with Sinn Féin on 19% and

Independents/Others on 16%.

The poll is based on a nationwide sample of just under 1,000 voters and the fieldwork was conducted between 3-12 August.