"The United States calls on Nuclear Suppliers Group (NSG) participating governments to support India's application when it comes up at the NSG plenary," State Department Spokesman John Kirby said.
"I'm not going to get ahead of how that's going to go or hypothesise and speculate about where it's going to go, but we've made clear that we support the application," Kirby said in response to a question at his daily news conference.
US Secretary of State John Kerry recently wrote a two-page letter to member countries who are sceptical towards India's membership of the NSG to "agree not to block consensus on Indian admission" to the group.
During the US visit of Prime Minister Narendra Modi last week, President Barack Obama welcomed India's application to the 48-member grouping.
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A joint statement issued after the talks between Modi and Obama said the US called on NSG participating governments to support India's application when it comes up at the NSG plenary.
China maintains opposition to India's entry, arguing that it has not signed Nuclear Non-Proliferation Treaty (NPT). China wants NSG membership for its close ally Pakistan if NSG extends any exemption for India.
India has asserted that being a signatory to the NPT was not essential for joining the NSG as there has been a precedent in this regard, citing the case of France.
The NSG looks after critical issues relating to nuclear sector and its members are allowed to trade in and export nuclear technology. Membership of the grouping will help India significantly expand its atomic energy sector.