Washington acknowledged "there are internal political issues for the Indian government to work out, and it's important that they have an opportunity to do so," State Department spokesman Tom Casey said on Monday, referring to the Left's opposition to the deal.

“We want to see the nuclear deal concluded as quickly as possible", the spokesman said. "But ultimately, the Indian government needs to be fully comfortable.” However, "It would be a shame if this opportunity, though, for both sides was lost, and we certainly therefore hope that we can reach an agreement as soon as possible", Casey said.