The US State Department has paid tribute to Julie Bishop for her five-year trailblazing role as Australian foreign affairs minister.
Ms Bishop was a highly visible presence on the world stage, regularly stepping into the lead role at summits and other gatherings when prime ministers Malcolm Turnbull and Tony Abbott were unable to attend.
The Trump administration, after building strong bonds with Mr Turnbull and Ms Bishop, will now attempt to forge similar partnerships with former treasurer and new prime minister Scott Morrison and Ms Bishop's replacement, Defence Minister Marise Payne.
"We worked very closely with former prime minister Malcolm Turnbull and enjoyed a very positive relationship with him and Foreign Minister Julie Bishop," a State Department spokesperson told AAP on Sunday.
"This included an official visit by the prime minister to the White House in February and hosting Foreign Minister Bishop for the Australian-US Ministerial (AUSMIN) Consultations in Palo Alto in July.
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"We are grateful for their service to the alliance and wish them all the very best going forward.
"We are confident that the close working relationship under Prime Minister Morrison will continue."
Ms Bishop told Mr Morrison on Sunday she will be resigning from her position as foreign minister and would move to the backbench.
Ms Bishop did make a bid for prime minister last week, but was the first casualty of the vote.
"We congratulate Scott Morrison on becoming the new prime minister of Australia," the State Department spokesperson said.
"The United States has no better friend than Australia.
"We look forward to working with the new prime minister and his cabinet."
