US
Anti-slavery activist Harriet Tubman will be on new $US20 bill
An African-American woman is to appear on the American currency for the first time.
New York wins boost Trump and Clinton
Hillary Clinton and Donald Trump, have scored big wins in New York. Audio
Polls open in New York primaries
To the US elections now, and voters in New York are casting their ballots in the state's high-stakes primary. Audio
US correspondent, Steve Almond
Trans-gender bathrooms. Culture wars. The presidential race. Audio
US 'could have shot down Russian jets'
The US military would have been within its rights to shoot down Russian jets that flew near its warship, the country's secretary of state says.
Russia/US Tension
Multiple times this week, Russian planes have flown aggressively close to a US warship in the Baltic Sea, the USS Donald Cook. Where might this behaviour lead? Audio
Barack Obama admits mistakes made in Libya
The US President Barack Obama says failing to prepare for the aftermath of the ousting of Libyan leader Col Muammar Gaddafi was the worst mistake of his presidency. Audio
What goes on in Chicago's off-the-books interrogation site
Documents released to the US edition of the Guardian show the extent of police force used at an off-the-books interrogation site in Chicago. Audio
Baboons with pigs' hearts offer hope for transplant patients
American and German scientists have managed to keep pig hearts alive in baboons for a record two and a half years in what is being hailed as an important advance with potential applications for… Audio
Are pundits underestimating Sanders' chances?
The outsiders in the American president race scored big wins in yesterday's Wisconsin primary. Audio
Wisconsin result deals new hand to presidential contenders
The American presidential primaries delivered another twist yesterday with defeats for frontrunners Donald Trump and Hillary Clinton in Wisconsin. Audio
Trump and Clinton lose Wisconsin primary votes
The United States Republican presidential candidate, Donald Trump, has suffered a blow in his campaign, losing the Wisconsin primary to his main rival, Ted Cruz. Audio
Trump loses big in Wisconsin
The United States presidential hopeful, Donald Trump, has suffered a major blow in the latest Republican primary in Wisconsin, with Ted Cruz winning the state. Audio
Key confident US will back TPP
The Prime Minister John Key thinks if Donald Trump became president he would do a u-turn and "miraculously" find a way to back TPP. Audio
US hosts Nuclear Security Summit
Delegations from 56 nations including the Prime Minister John Key have arrived in Washington to participate in the fourth Nuclear Security Summit. Audio
Cotton wool wrapped universities
Can a safe utopia for learning be created to protect students from any possible cause of discomfort? Audio
Republican establishment desperate to oust Trump
Moves by key Republicans to stop Donald Trump winning the nomination have ramped up as the pivotal Wisconsin primary looms. Audio
Trump's campaign manager charged with battery
Donald Trump's campaign manager has been charged with battery and accused of grabbing a reporter on the arm. Audio
