Late on Sunday, the military council said it has set up a committee to register NCP properties and take control of them.
Activists voiced fears that the army would make a new attempt on Tuesday. "We know what happened in Egypt and we don't want that to happen to us".
Egyptian President Abdel Fattah Al-Sisi has reiterated Egypt's support for "the brotherly Sudanese people's will" and said Cairo would "not interfere in its internal affairs", according to a presidential statement.
The protests began December 19, with demonstrators accusing al-Bashir's government of economic mismanagement that sparked skyrocketing food prices, and fuel and foreign currency shortages.
During the meeting, Daqlo briefed the USA envoy on developments in Sudan and the reasons behind the formation of the transitional military council, the council said in a statement.
The honeymoon of his successor, General Burhan, has lasted just days. Dozens of people were killed in a security crackdown aimed at quashing the protests.
"[The union] strongly condemns and totally rejects the seizure of power by the Sundanese military and its plan to lead the transition for two years", the union said in its communique, adding that if it fails to hand over power to civil society within 15 days it will suspend "the participation of Sudan in all A.U.'s activities until the restoration of constitutional order".
Also on Sunday, the military council said it had arrested members of the former government and vowed to leave protests alone while stating that the former ruling National Congress party would be barred from participating in the interim government.
The protesters have already forced the first choice of the military as leader of the council to step down, and caused the resignation of the head of the National Intelligence and Security Service (Niss).
Sudanese protesters have kept up a sit-in outside army headquarters in Khartoum since April 6. It said a civilian authority should hold elections "as quickly as possible".
And UN Secretary General Antonio Guterres appointed Nicholas Haysom as an envoy to Sudan to work with the union on mediating an end to the crisis.
Sudan's military council which took over government last Thursday, said Bashir was in 'safe custody, but the latter has not made a public appearance since then.
Having initially refused to deliver Bashir or any other Sudanese overseas for prosecution, a member of the council said Monday that the decision would be up to a civilian government.
The protests against al-Bashir gained further momentum after Algeria's President Abdelaziz Bouteflika, in power for 20 years, resigned earlier this month in response to weeks of similar protests.