The Greens have ramped up their rhetoric against the alliance with the United States in the wake of Donald Trump's victory, suggesting the strategic arrangement has become a "security threat to Australia".

Party leader Richard Di Natale says that President-elect Trump's high-profile views on domestic and international affairs represent "an ally's worst nightmare" and highlight a need for Australia to redefine the relationship with the US and operate more independently.

"In light of the threats presented by Trump's election, the Greens are intensifying our calls to undertake a fundamental reassessment of the alliance. This is something we have been talking about for a long time," Senator Di Natale said in a speech to the Australian Institute of International Affairs national conference.

The Greens leader said Mr Trump's views on climate change, refugees, defence spending, nuclear proliferation, trade and authoritarian governments make his country a "dangerous ally".