The White House said today that the two presidents will meet tomorrow in Dar es Salaam at a wreath-laying ceremony at the site of the deadly 1998 bombing of the US Embassy that killed 11 people. The embassy has since relocated.
Obama arrived in Tanzania today, the final leg of a three-country tour of Africa. Bush, who has been active on African issues both in and out of office, coincidentally also planned to be in Dar es Salaam for a conference on African women sponsored by his institute.
"This is one of his crowning achievements," Obama said at a news conference where he and Tanzanian President Jakaya Kikwete were asked to comment on the Bush meeting. "Because of the commitment of the Bush administration and the American people, millions of people's lives have been saved."
Obama also pushed back against suggestions that his administration has scaled back the programme.
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"The fact of the matter is is that we are serving four times the number of people today than we were when PEPFAR first began," he said. "But because we've gotten better at it and more efficient at it we're doing it at reduced costs."
The White House has said the US will spend about USD 4.2 billion on PEPFAR funding this year, money that has been used to increase the number of people receiving anti-retroviral drugs and to prevent mother-to-child transmission of the virus.
"This indicates how timely the PEPFAR programme was and the bipartisan support that it has received has been extraordinary and President Bush deserves enormous credit for that," Obama said, "and so I'm looking forward to being able on African soil to once again thank him on behalf of the American people for showing how American generosity and foresight could end up making a real difference in people's lives."
First lady Michelle Obama and former first lady Laura Bush also plan to appear together tomorrow to participate in a discussion at the conference on promoting women's education, health and economic empowerment.
Obama and Bush last appeared together in public at the April dedication in Dallas of Bush's presidential library.