An Umno Youth revolt against party president Najib Abdul Razak is in full swing.

Hours after Youth chief Khairy Jamaluddin rallied the party to him and called for immediate reforms, one of his exco members - Arman Azha Abu Hanifah - openly called for Najib to resign.

"Representing the Umno Youth Kesatria Briged, I wish to call on Najib to let go of the president's post willingly, so a transformation of Umno can take place.

"We demand Najib immediately resigns... We believe Najib has to be responsible for BN's defeat in the 14th general election.

"We don't hate Najib, but we prioritise the party's interests to ensure its survival," Arman said in a statement today.

The Federal Territories and Selangor Umno Youth wings have also joined calls from their Kedah and Terengganu counterparts in calling for Najib to quit.

Federal Territories Umno Youth chief Razlan Rafii (photo) said the party's top leadership must take responsibility for its defeat in the 14th general election.

"The party's top leadership must take full responsibility for this disaster and be prepared to step down and make way for new faces to lead this party," he said in a statement today.

When contacted, Razlan clarified that the top leadership meant "the president and other top leaders".

Meanwhile, Berita Harian reported that Jelebu Umno division chief Jalaluddin Alias also called for the resignations of Najib and Negeri Sembilan Umno chief Mohamad Hasan.

Khairy had called for immediate reforms to Umno to save the party from collapse.

"I call on my comrades who wish to rebuild Umno, from the collapse we have seen today, to stand with me as change must begin immediately. We cannot delay any further.

"Umno's contribution to religion, race and country is too great for us to allow this sacred party to be destroyed and disappear forever," Khairy said in a posting on Facebook.

Umno-BN was trounced in Wednesday's 14th general election, with Pakatan Harapan forming the new federal government.