A new opinion poll suggests a rise in support for Independent Ireland and Aontú.
The Sunday Independent/Ireland Thinks Poll puts Independent Ireland on 9%, a rise of three percentage points on the last such poll in April.
Support for Aontú is up one point to 7%, putting the two parties on a combined 16% of the vote.
TDs from both Independent Ireland and Aontú spoke at various fuel protests last month.
The survey suggests support for Fianna Fáil has fallen, down two points to 17%. Taoiseach Micheál Martin has also seen a six-point drop in his approval rating among the voters surveyed.
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Fine Gael is unchanged at 17%.
Sinn Féin remains the most popular party in polling - its standing is unchanged at 22%.
The Social Democrats is on 9%, the Labour Party is on 4%, the Green Party is on 3% and Solidarity/People Before Profit are on 2%.
The poll was carried out yesterday through an SMS survey of 1,774 adults.
The margin of error is plus or minus 2.4%.
Political parties will closely study the findings of the survey with an eye to this month's bye-elections in Dublin Central and Galway West, although results in bye-elections do not always chime with national opinion polls.
