The United States is calling on the World Health Organization (WHO) to immediately begin work on an investigation into the source of the coronavirus outbreak and subsequent timeline of events.

In a letter to the WHO’s executive board meeting in Geneva on Friday, US Assistant Secretary for Health Brett P. Giroir wrote: “As President Trump just made clear in his May 18 letter to Director-General Tedros, there is no time to waste to begin on the reforms needed to ensure such a pandemic never happens again.”

“We applaud the call for an impartial, independent, and comprehensive review, to be undertaken in consultation with member states, and urge that work begin now,” Giroir wrote.

He said that such a review will ensure there is a thorough understanding of the “source, timeline of events, and decision-making process for the WHO’s response to the COVID-19 pandemic.”