The Malaysia United Democratic Alliance (Muda) has given the Registrar of Societies (ROS) seven days to grant its application to register as a political party or risk legal action.

Muda's pro-tem committee led by Muar MP Syed Saddiq Syed Abdul Rahman - as one of the 13 co-founders - handed over to ROS the group's legal letter issued by the legal firm of former attorney-general Tommy Thomas.

Thomas, alongside former rights group Hakam chairperson Ambiga Sreenevasan, has been appointed to represent Muda in the bid to seek justice from ROS on the issue of its registration as a formal political party.

"We were informed that the matter is still under ROS' consideration.

"No decision has been made just yet," Syed Saddiq told reporters outside the ROS headquarters in Putrajaya this morning.

"If our application is not granted in seven days, we will take this case to court, represented by these two lawyers.

"We are very serious. We thank these two renowned lawyers for being with us to facilitate Muda's registration," Syed Saddiq added.

Having once been a part of Bersatu's founding members and later appointed as its youth chief, Syed Saddiq recalled that the party was registered in 30 days, unlike the current situation where more than 90 days have passed since Muda submitted its application.

"This was during BN's time... Why is it easier to be registered during the time of Najib (Abdul Razak) and (Ahmad) Zahid (Hamidi) than under the present administration?" he asked.

The former youth and sports minister pointed out that the approval was granted despite Bersatu being founded by former prime minister Dr Mahathir Mohamad after a fallout with Umno and that it soon became a platform for the party's disgruntled members.

This, Syed Saddiq added, was much unlike Muda's support base among multi-racial Malaysian youths.

"If it is true we are seen as weak, we are unable to influence Malaysia's political landscape, then why be afraid to the point of blocking our way?"

According to Muda's legal letter, which was distributed to the media, its application to the ROS was first submitted on Sept 17.

On Oct 3, Muda submitted a revised proposed constitution based on ROS' requests made during a previous meeting with several pro-tem committee members.

More than a month later, on Nov 25, the ROS requested each of the pro-tem committee members to provide their bankruptcy status and the group said they had immediately complied with the request.