'Our citizens have chosen a president who represents a triumph of the American story - a testament to hard work, optimism, and faith in the enduring promise of our nation,' he said in his weekly radio address.

'He can count on my complete cooperation as he makes his transition to the White House. Ensuring that this transition is seamless is a top priority for the rest of my time in office,' said Mr Bush, who steps down Jan 20.

The president cited the global economic crisis and the global war on terrorists who, he warned, 'would like nothing more than to exploit this period of change to harm the American people.'

Mr Bush said efforts had been ongoing for more than a year to ensure a flawless transition, including briefings on key policy issues.

'Americans expect their president to conduct the people's business. I will continue to uphold this solemn obligation for as long as this office remains in my trust,' he said.

'In the meantime, I join the American people in wishing President-Elect Obama every success. Laura and I wish the Obama family as much joy and happiness as our family has found in this wonderful house,' he said. -- AFP