A Sydney division of the Liberal Party will debate whether Australia should end all immigration and ban all refugees, after an incendiary motion was put forward calling migrants "criminals" and "bastards".

The president of the Carlingford branch, George Popowski, will use a party conference on Thursday to call on the Turnbull government to halt "all immigration and refugee intakes" until an investigation can establish the "risks and benefits" for Australia.

In a rambling preamble attached to the motion, Mr Popowski accused migrants of a litany of sins including forging documents, faking degrees, rorting the visa system, slacking on welfare and also taking jobs from locals.

"The last thing we need is foreign workers. Get the bastards who are here, off their back-sides! 80% of all new arrivals are on benefits – some for over 10 years!" he wrote. "Simple: compulsory work for the dole – plus, prison for all the crooked quacks who've signed them up for the DSP!"