PM Malcolm Turnbull has a new challenge in the Senate. Picture: John Feder/The Australian.

With Mr Turnbull’s coalition winning 30 seats, his government will need nine extra votes in the Senate to pass motions and laws.

The single largest bloc is One Nation, which will have the staffing and resources of a party and four senators led by Queensland firebrand Pauline Hanson.

Ms Hanson’s senators have been given the green light to vote according to their own will in parliament.

Her Queensland running mate Malcolm Roberts said he had already received phone calls from Mr Turnbull and leader of the government in the Senate, George Brandis.

Mr Roberts said his party would seek income tax cuts, a crackdown on multinational tax evasion and action on Islamic extremism, free speech and family law court reform.

Mr Roberts, who officially said his allegiance was to the Queensland people, not Ms Hanson.

“Pauline Hanson told me and every other candidate, if you disagree with the party, you have a responsibility to cross the floor and that convinced me about this woman,” he said.

Mr Roberts also wants amendments to section 18C of the Racial Discrimination Act to allow free speech.

Pauline Hanson has already met with Malcolm Turnbull.Source:News Corp Australia

“When we have free speech curbed we don’t talk about the real issues — tax, Islam, terrorism, the economy,” he said.

The Queensland senator-elect also wants an inquiry into the Bureau of Meteorology and the CSIRO, the latter of which he’s accused of “corrupting the science”.

Mr Roberts is a staunch sceptic of the impact of man-made climate change, calling for changes to climate policy which assumes humans contribute to global warming.

“There is not one piece of empirical evidence anywhere showing humans cause (climate change),” he said.

The mining engineering graduate also declared himself a scientist saying scientists relied on the scientific method. However, Mr Roberts was more circumspect on his support for government policies such as restoring the construction industry watchdog.

While he was against union corruption, he’d wait until seeing the ABCC bill before finalising his position.

One Nation Senator Malcolm Roberts speaks about what he wants for Queensland voters. Picture: Claudia BaxterSource:News Corp Australia

Mr Roberts also backs a plebiscite on legalising gay marriage.

One Nation’s support will be crucial to passing the double dissolution trigger bills restoring the building industry watchdog and imposing tougher penalties for union corruption.

Mr Turnbull will try to get the bills through parliament house-by-house, but the double dissolution election gives him the option of holding a joint sitting of both houses and securing 114 votes to ensure their passage.

Mr Roberts said his party was concerned about union corruption, but he could not comment on legislation before seeing it.

Another large bloc is the Nick Xenophon Team, which will have three South Australian senators.

Senator Xenophon said he would seek to find common ground with all senators “whether they are from the left or right”.

His team will support an amended version of the workplace bills, if the government incorporates changes on occupational health and safety, the Australian building code and Australian content in the industry.

Nick Xenophon is another crucial player in the Senate. Picture: Emma BrasierSource:News Corp Australia

Labor will have 26 senators, while the Greens will have nine — down one on the previous parliament but still a significant bloc. Family First senator Bob Day, the Liberal Democrats’ David Leyonhejlm, and independent Jacqui Lambie retained their seats in South Australia, NSW and Tasmania respectively.

Broadcaster Derryn Hinch, who won a seat in Victoria, rounds off the 11-member crossbench.

Labor leader Bill Shorten said One Nation’s rise was a direct result of changes to Senate voting rules and the double dissolution election.

Derryn Hinch will be holding the government to account. Picture: Ian CurrieSource:News Corp Australia

Former Labor minister Craig Emerson said it remained to be seen what Mr Turnbull would need to give away to get Ms Hanson’s party on side.

“My worry in relation to One Nation is Pauline Hanson has a very right-wing agenda — it is anti-Islam, it is very nationalist,” Dr Emerson told Sky News on Thursday.

“In the Senate it is always about quid pro quos — you give me something, I give you something.” Greens leader Richard Di Natale said it was a “very eclectic mix of senators”.

He said his party would work with others in the Senate, but would also speak out against racism and the targeting of minority groups.