The head of the U.N. AIDS agency says the number of new HIV infections could jump more than six times by 2029 if U.S. withdraws support for AIDS program.

UNAIDS' executive director warned that millions of people could die and more resistant strains of the disease could emerge.

More than 20 years ago, the U.S. became the leader in the worldwide fight against HIV/AIDS. The Bush administration initiative Pepfar was the largest health commitment made by a nation to combat a single disease.

The head of the U.N. AIDS agency warns that millions could die and more resistant strains of the disease could emerge.