Prime Minister Najib Abdul Razak's wife has found an unlikely white knight in the form of opposition lawmaker Rafizi Ramli.

He has responded to Rosmah Mansor's lament about her hairdo costing RM1,200.

Feeling Rosmah's pain, the Pandan MP announced on Twitter a spin-off of his earlier popular #TurunHargaKereta campaign which forced BN to counter with its own pledge to slash car prices during the 13th general election.

Rafizi dubbed the new campaign #turunhargadandanrambut, or reduce hairdo prices, and with a similar black and yellow banner from his previous campaign, except this time it is replaced with what appears to be an outcrop of Rosmah's unique hairstyle.

The PKR secretary-general posted the banner on Twitter, declaring: "Support #turunhargadandanrambut to lessen Rosmah's hairstyling burden. Easier still, she should just cover aurat."

The tongue-in-cheek campaign is aimed at Rosmah, who earned public ridicule after she lamented "on behalf of housewives" over expensive home call hairdos.

"Now, when I want to dye my hair at home, the hairdresser charges me RM1,200.

"Wow, that is expensive but they say the price is different in the store. It’s pricey because it is home service," she was quoted as saying during a Goods and Services Tax (GST) event on Monday.

Contacted later, Rafizi ( right ) said his campaign is a sarcastic response to Rosmah and her family who appear "out of touch" with the people.

"If the prime minister's family understands the problems and burdens, she would not have declared to the rakyat about her RM1,200 hairdo.

"It shows the prime minister is living in extravagant luxury. Therefore, they have become out of touch with common people," Rafizi added.

The New York Times had previously highlighted about Najib's family wealth, including stacks of money at his home, as alleged by former aide Ariff Sabri Abdul Aziz, who is now an opposition MP.

Responding to the US-based newspaper, the Prime Minister's Office had this to say: "Neither any money spent on travel, jewellery purchases nor the alleged contents of any safes are unusual for a person of the prime minister's position, responsibilities, and legacy (of) family assets."

The comment alluding to wealth inherited from Najib's father Abdul Razak Hussein, who is a former prime minister, irked his other siblings.

The four brothers responded with a joint statement on Tuesday, stating that such claims tainted their late father's good name who they said was frugal with public funds.

Their statement was blacked out by the mainstream English and Malay language newspapers.