BN strategic communications director Abdul Rahman Dahlan has pointed out that he has answered who Malaysian Official 1 (MO1) is with regard to the United States Department of Justice (DOJ) civil suits related to 1MDB.
"Didn't I say it already in front of millions of BBC's international audience? Still asking?" he tweeted.
Rahman was responding to another Twitter user, who said those who still questioned the identity of MO1 are "donkeys".
This was in reference to Pakatan Harapan MPs holding up placards with the words 'Who is MO1?' when Prime Minister Najib Abdul Razak was tabling Budget 2017 in Parliament.
The MPs later staged a walkout, when Speaker Pandikar Amin Mulia told them to leave the House if they were not interested in listening to the budget speech.
Rahman had previously confirmed that MO1 is Najib, but pointed out that since he was not named in the DOJ documents, the prime minister was not being investigated.
The DOJ suits had named four individuals, including Najib's stepson Riza Aziz and Malaysian-born businessman Jho Low, who is said to be close to the prime minister’s family.
Najib has repeatedly denied abusing public funds for personal gain, and the attorney-general had also cleared him of any wrongdoing.
Meanwhile, Rahman also engaged in a tweet-for-tat with another user who claimed that the democratic institutions in Malaysia are in a pathetic state.
"Then why bother showing up in Parliament. Ask your friends to sleep at home," replied the minister in the Prime Minister's Department.
"Your comments are now reduced to red bean army mentality. Don't hurt your reputation," he added.
The term 'red bean army' is used to describe DAP's alleged cybertroopers. However, the opposition party has denied having such individuals on its payroll.- Mkini