The row at the Luas has spread to include the leading figures in the country's industrial relations mechanism.
The head of the Workplace Relations Commission says he has no intention of standing down, after being called on to do so by the President of SIPTU.
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The Transport Minister says he won't intervene in the row, and spend taxpayers' money on it.
Luas drivers are striking tomorrow and on Sunday, after overwhelmingly rejecting a pay deal brokered at the WRC last week.