Employers immediately hit back,with Australian Industry Group chief executive Innes Willox alleging the TWU action would breach the Fair Work Act's prohibition against pattern bargaining.
TWU secretary Michael Kaine rejected this,saying the union would operate within the rules to pursue sector-wide outcomes,in a campaign that aims to persuade large companies to support wage rises for contract workers.
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"We won't be pattern bargaining,"Mr Kaine said.
"What we will be doing is using the current system to the letter of the law. We make no apology for this approach."
Business leaders say the person who replaces industrial relations minister Kelly O'Dwyer,expected to be announced this week,must"bridge the class divide"and deliver reforms that promote job creation and economic growth,including a relaxation of workplace laws.
Defiant union leaders have vowed to fight hard against any watering down of worker rights - arguing the Morrison government has no mandate to do so - as they prepare to launch a'plan B'in pursuit of thewage rises promised by former Labor leader Bill Shorten.