CANBERRA, AUSTRALIA - JULY 04: Senator Malcolm Roberts debates the Treasury Laws Amendment (Tax Relief So Working Australians Keep More Of Their Money) Bill 2019, in the Senate at Parliament House on July 04, 2019 in Canberra, Australia. Prime Minister Scott Morrison is introducing his proposed $158 billion income tax cut plan into the Senate today, after it passed the Lower House on Tuesday night. (Photo by Tracey Nearmy/Getty Images)