Bangladesh's Ambassador to Washington Akramul Qader met with the officials of the US State Department and Department of Justice Friday night over the 21-year-old.
If consular access is granted, a diplomat from the embassy would be able to meet Nafis in person.
The sit-down came three days after Nafis was arrested in New York for trying to detonate a 1,000-pound bomb outside the Federal Reserve Bank in Manhattan.
Quader told bdnews24.com, "We have asked for time to meet Nafis. If he asks us for legal help, we will provide it."
"We have been given the copy of Nafis' passport. We are now confirmed that he is a Bangladeshi citizen.
"We are determined to provide him with the civil rights he is entitled to. We have also confirmed the matter to Deputy Assistant Attorney General Bruce Swartz (also the Department of Justice's Counselor for
International Affairs)," the Ambassador added.
Foreign Secretary Mohamed Mijarul Quayes around 1am Saturday had told bdnews24.com that Bangladesh embassy officials have asked for consular access during the parley with the officials of the State Department and Justice Department.
The meeting was held at the Department of Justice in Washington at around 11:00pm Bangladesh Standard Time (Washington time 1pm noon).
Ambassador Qader said, "If it is proven in the trial that Nafis genuinely wanted to carry out a terrorist attack in the United States, we will accept the punishment he is handed down."
He also asked the State Department and Justice Department officials not to show any hostile attitude towards the other Bangladeshi expatriates in the US because of one individual's action.
They assured the Bangladeshi officials that there was no need to show that kind of attitude towards the other Bangladeshi-Americans only because of Nafis, Qader added.
The charges against Nafis, the son of a middle-class family, have received heavy media coverage and the accusations of terrorism have also threatened to undermine the country's reputation as a moderate Muslim nation. Bangladesh is not typically a hotbed of terrorist activity, although one native of the nation was held by the US at Guantanamo Bay, according to American media.
The Foreign Secretary had said earlier, "I have not received the full report on the meeting until now (1am Saturday). I will be able to brief tomorrow (Saturday) if I get the copy within the night."
Earlier, at a press briefing on Friday, Foreign Minister Dipu Moni had said, "It is a serious matter and I will not speak until I get feedback from our US mission."
"If we cannot have a formal press conference, me or the Foreign Secretary will convey the latest situation or issue a press release," she had said.
New York police and Federal Bureau of Investigation officials arrested Nafis on Wednesday morning in downtown Manhattan after he allegedly attempted to detonate what he believed to be a 1,000-pound bomb at the New York Federal Reserve Bank on Liberty Street in lower Manhattan's financial district.
The FBI said Nafis parked a van laden with 'explosives' in front of the bank in Manhattan and went to the adjacent Millennium Hilton Hotel. From there, he repeatedly tried to set off the mobile phone detonator of the bomb. However, it did not explode as the explosive was fake.
The Department of Justice said in a statement on Wednesday Nafis had been charged with attempting to use a weapon of mass destruction and provide material support to al Qaeda. He faces life sentence in prison, if convicted.
Bangladesh's Permanent Representative to the UN AK Momen had earlier told bdnews24.com, "Even if Nafis is a Bangladeshi, it is a separate story. The people and the government of Bangladesh do not believe in terrorism."
Bangladeshi police detectives on Thursday had raided the 107/4, North Jatrabari residence of Nafis's parents and questioned his family members.
Family members said Nafis was a student of the North South University and before that he had studied in the Dhaka College. He went to the US on January on student visa to study cyber-security at the Southeast Missouri State University.
Additional Deputy Commissioner of Police Masudur Rahman told bdnews24.com on Friday night that the Nafis' family were under watch.