U2 frontman Bono has condemned the Canadian prime minister for failing to meet a pledge to boost the country's commitment to foreign aid.
Bono has become a high-profile campaigner against poverty
The rock star said he was "bewildered" at Paul Martin, adding he did not believe the politician "would want to hold up history".
Bono went on to read out the number of Mr Martin's office on Canadian radio, urging listeners to call him.
The singer campaigns to alleviate debt and poverty in the developing world.
In November 2003, Bono addressed Canada's Liberal Party conference when Mr Martin was elected leader and praised his pledge to increase foreign aid.
"I'm going to be the biggest pain in the ass," the musician told delegates then.
In the interview on CBC radio he said: "We were looking for Canada to lead rather than be a laggard," adding that it felt like "business as usual".
"This is no time to just turn inward. I know there are problems here at home. But don't lose your focus, prime minister, on how history will remember this moment," Bono said.
Mr Martin is facing a fight to save his minority government, which has been rocked by a financial scandal.