CPI(M) general secretary Sitaram Yechury on Tuesday hit out at the government for "capitulating" to the US over its decision to partially lift a ban on export of anti-malarial drug hydroxychloroquine.
The party also condemned the "retaliation" threat made by the US President Donald Trump.
The government's decision came a week after a telephonic conversation between Prime Minister Narendra Modi and Trump, who sought supply of hydroxychloroquine to the US to treat coronavirus infected people.
Trump on Monday said he would be surprised if New Delhi did not relent to the request as it has good relations with Washington and warned India of retaliation if it did not export the anti-malarial drug despite his personal request.
"The statement by US President is unacceptable. But Modi govt has succumbed to the threat by allowing the export. That this happened after an expensive gala was organised for him by Modi, instead of preparing to contain Covid-19, shows how this govt has let down India," said Yechury in a tweet.
Trump had appreciated that India was allowing the supply (of hydroxychloroquine) to come out, but if it did not, "that would be okay, but of course, there may be retaliation, why wouldn't there be?"