He issued this statement during a session of the Public Accounts Committee (PAC).
Amin Aslam however denied the lawmaker's claim and released a video message saying that Fatyana will face disciplinary action by the PTI over his remarks.
The committee was examining audit reports of the Ministry of Climate Change for the year 2019-20. Rana Tanveer Hussain chaired the meeting.
Fatyana stated that during the UN conference on climate change, Minister for State Zartaj Gul got into an argument with PM's Adviser Amin Aslam after which she returned to Pakistan before the conclusion of the event. He added that Pakistan was not properly represented in the conference as the official from the ministry displayed incompetence. The MNA further claimed that delegated from Nepal and other countries in the camp were not received by any Pakistani official.
In his video message, Aslam said that Fatyana was lying and that Zartaj Gul had to return to Pakistan to attend the joint session of the parliament. He alleged that Fatyana made this statement because he was attending the conference with an NGO and was refused official protocol from the ministry after which he harassed the ministry officials.