A new opinion poll suggests a drop in support for Sinn Féin and slight increases in support for Fianna Fáil and Fine Gael.

The Behaviour & Attitudes poll conducted for tomorrow's Sunday Times shows Sinn Féin down six points compared to last month to 17%.

Fine Gael has gained one point bringing it to 31%, while Fianna Fáil is up two to 29%.

It is Sinn Féin's largest ever setback in a single month in a Behaviour & Attitudes poll for The Sunday Times.

The Labour Party is down one to 5%, the Independent Alliance is up one to 2%, with Solidarity People Before Profit unchanged on 2%.

The Green Party is up two to 3%, the Social Democrats are up one to 2%, while Independents are up one to 10%.

Satisfaction with the Government has dropped one point to 41% while satisfaction with the Taoiseach is unchanged, at 48%.

Fianna Fáil’s Micheál Martin is the most popular party leader with 50% support while Sinn Féin’s Mary Lou McDonald has dropped four points to 44%.

The poll was conducted between 6-18 December in a series of face-to-face interviews with 911 eligible Irish voters.

The margin of error was 3.3%.

The findings compare with a poll published on 18 November.