Former Prime Minister Tun Dr Mahathir Mohamad's collaboration with UMNO's sworn enemies is a clear testimony that the fight is no longer between him and Prime Minister Datuk Seri Najib Razak but UMNO.

"Now, it's between Tun and UMNO," said Barisan Nasional (BN) strategic communications director, Datuk Abdul Rahman.

Abdul Rahman on his Twitter today said the veteran politician's move in collaborating with his detractors would only strengthen Najib's position.

He also added that Dr Mahathir does his 'funny' stuff, the more entrenched Najib's position in UMNO will be, as the grassroots would continue to support the party president.

"The response I got from UMNO grassroot leaders on my WA (WhatsApp) and Telegram groups was unequivocal - Stand behind the President!."

Earlier, Dr Mahathir signed a declaration with the country’s former leaders, Opposition leaders, political activists and leaders of non-governmental organizations (NGO).

The declaration billed, ‘Citizens Declaration’ contains four demands, among others calls for the resignation of Najib as Prime Minister.