U.S. President Joe Biden on Wednesday called for a deeper intelligence investigation into the origins of COVID-19, giving new life to claims that the coronavirus escaped a Chinese lab.

After more than a year hunting for the pandemic’s mysterious origins before the first cluster was found at a Wuhan food market, it’s unclear what new resources American spies may bring to the search. Biden’s order also reopens a rift with Beijing, which has impeded previous international investigations and punished foreign governments for suggesting it has something to hide.

In a surprise statement, Biden announced that the U.S. intelligence community had delivered a report to him earlier this month on the virus’s origins. The document acknowledged divisions over whether the virus was naturally transmitted from animals to humans — the prevailing theory of scientists — or whether it leaked from the Wuhan Institute of Virology, a claim popular with Republicans that hasn’t been ruled out by experts.