A Muslim Brotherhood leader has threatened legal action against the National Salvation Front (NSF) after the latter called for the annulment of Egypt’s new constitution.

Mahmoud Hussein, secretary general of the Brotherhood, said that the constitution cannot be annuled. "The constitution was approved by a transparent referendum," he said.

Speaking to the Saudi owned Al-Arabiya satellite channel, Hussein added that he is surprised the government has not taken legal action against those who question the legitimacy of President Mohamed Morsi.

Egypt’s 234-article constitution was approved earlier in December by 63.8 per cent of the vote in a two-phase referendum.