Prime Minister Malcolm Turnbull has launched a Donald Trump-like Twitter tirade in a response to a report that the government will scrap concession cards and welfare payments in the May budget, saying it's "false" and he "outright" rejects it.

In a series of four tweets the Prime Minister slapped down the report in News Corp newspapers on Sunday which said the government was looking to scrap all welfare payments below $20.02 a fortnight, a change targeted at aged pensioners.

The commission of inquiry bill could prove to be a real test for Prime Minster Malcolm Turnbull. Credit:Alex Ellinghausen

"I can assure all aged pensioners the measure reported will NOT be in the budget," Mr Turnbull tweeted.

In another tweet he said he had assured the author of the story this was the case, "but she insisted on writing the story".