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© Reuters / Craig Lassig
Researchers work with coronavirus samples as a trial begins to see whether malaria treatment hydroxychloroquine can treat Covid-19, at the University of Minnesota in Minneapolis.
US President Donald Trump has warned that Washington may retaliate against New Delhi over a decision to bar exports of an experimental treatment for Covid-19, not long after asking his Indian counterpart to reverse the move.

Though India on Saturday imposed a blanket ban on the export of hydroxychloroquine - an antimalarial drug under clinical trial as a treatment for the coronavirus - Trump told reporters on Monday that New Delhi could face consequences if Prime Minister Narendra Modi fails to drop the restriction, insisting he wasn't aware that a final decision had been made.

"I don't like that decision. I didn't hear if that was his decision. I know he stopped it for other countries," Trump said, referring to the Indian PM. "I would be surprised if he would, because India does very well with the United States, for many years they've been taking advantage of the United States on trade."
If [Modi] doesn't allow it, that would be OK. But of course there may be retaliation. Why wouldn't there be?
Indian producers provide the US with nearly half of its supply of the drug, according to Bloomberg News. It has been repeatedly touted by President Trump as a potential treatment for the deadly virus gripping all 50 states and much of the world. While concrete evidence for its effectiveness against Covid-19 remains thin, testing is already underway in states like New York and Michigan, while US Surgeon General Jerome Adams acknowledged on Sunday that there were early signs the drug was "helping."

After a phone call with Modi over the weekend, Trump said his counterpart was "giving serious consideration" to allowing hydroxychloroquine to continue flowing to the US, adding that he told Modi he "would appreciate it if they would release the amounts that we ordered," but the PM has yet to announce a reversal of the ban. A readout of the phone call provided by the Indian Foreign Ministry also made no mention of the request.

The export restrictions come as India sees a surge of infections, the state of Maharashtra being the worst-hit, counting 4,778 cases of Covid-19 across the country and 136 deaths, according to Johns Hopkins University. All of India was placed under lockdown by order of the prime minister in late March to stem the spread of the virus, set to last until mid-April barring any decision to extend it.