The Muslim Brotherhood has called for mass protests across Egypt to demonstrate against sweeping new powers taken by the ruling military council.
Over the weekend, the generals issued two decrees dissolving the Islamist-dominated parliament and claiming all legislative power for themselves.
MPs are also expected to try to enter the parliament building on Tuesday.
Meanwhile, the Brotherhood has said the official results of the presidential election confirm its candidate has won.
A spokesman for the Islamist movement's Freedom and Justice Party (FJP) announced that its chairman, Mohammed Mursi, had received 13,238,298 votes, or 52%, compared with former Prime Minister Ahmed Shafiq, who he said had 12,351,184 votes, or 48%.
The Higher Presidential Election Commission (HPEC) is scheduled to announce the official results on Thursday, but it usually shares them with the candidates beforehand to give them a chance to make objections.