India, May 4 -- A group of powerful US Democratic lawmakers have expressed frustration over the delay in the implementation of the Biden administration's decision to release the country's supply of unusable AstraZeneca Covid-19 vaccines to India and other countries that need them and demanded their speedy delivery.

"Time is of the essence. Without assistance from the United States, new vaccine-resistant mutations could arise across the globe, threatening international public health and the United States' national security and economic prosperity," four Democrats, who head powerful congressional committees, said in a joint letter to Secretary of State Antony Blinken and Health Secretary Xavier Becerra.

The signatories are Carolyn Maloney...