The Stormont government is under threat following the surprise move yesterday.
Belfast-based security correspondent Alan Murray says Sinn Fein's Martin McGuinness made no mention of any problems during his Ard Fheis speech on Friday.
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“In his speech on Friday evening, Martin McGuinness said they'd got changes to the Welfare Bill and they were satisfied with it” he said.
“Now that's Friday night – morning, they're not satisfied with it”.
“So it's prompting the question did they got such flack at the Ard Fheis that they said 'we can't really go ahead with this' – or did delegates from the South say 'we're being hammered down here, you just can't go ahead, it will destroy our election hopes in the Republic” he added.
