U.S. President Joe Biden on Wednesday threw his support behind waiving intellectual property rights for COVID-19 vaccines, bowing to mounting pressure from Democratic lawmakers and more than 100 other countries, but angering pharmaceutical companies.

Biden voiced his support for a temporary waiver — a sharp reversal of the previous U.S. position — after a speech at the White House, followed swiftly by an official statement from his chief trade negotiator, Katherine Tai.

"This is a global health crisis, and the extraordinary circumstances of the COVID-19 pandemic call for extraordinary measures," Tai said in a statement, amid growing concern that big outbreaks in India could allow the rise of vaccine-resistant strains of the deadly virus, undermining a global recovery.