Donald Trump’s impending return to White House has foreign leaders jockeying for position as U.S. President Joe Biden attends his final G20 Summit.

When President Joe Biden worked to burnish his climate legacy in the Brazilian Amazon on Sunday, the unspoken presence of Donald Trump shadowed the historic stop.

The president approved Ukraine’s use of long-range missiles inside Russia, but that decision, among others, may soon be reversed.

The president toured the rainforest and promised Brazil funds for environmental initiatives, even as the incoming Trump administration appears poised to roll them back.

President Joe Biden's apparent green light for Ukraine to strike Russia with US-made long-range missiles has caused consternation among Donald Trump's allies. Trump himself has not commented, but he won the election after promising to end the war - and people close to him have condemned the move as dangerous escalation.

His valedictory visit to South America marks an end to an era as other leaders look ahead to a Trump presidency.

President-elect Donald Trump said on Monday that he is prepared to declare a national emergency and use military assets to push his mass deportation operation in January.

"Stop playing by rules that no longer exist. At this point, it's not just spinelessness, it's complicity," the president-elect's estranged niece said.

Joe Biden wandered into the Amazon rainforest after giving a speech warning of the dangers of climate change. Wearing an open-necked blue shirt, dark slacks and his trademark Aviator sunglasses, the 81-year-old outgoing US president turned away from the podium and ambled into greenery.

The Biden administration is working against the clock to try to preserve at least some of the outgoing president’s legacy before Trump takes office.