Federal minister Abdul Rahman Dahlan lambasted at what he described as DAP MPs' "lame" attempt to defend Penang Chief Minister Lim Guan Eng over his RM2.8 billion bungalow purchase, said to be below market price.

Abdul Rahman, who is BN strategic communications director, took issue with DAP's Kluang MP Liew Chin Tong and Tanjong MP Ng Wei Aik's statements blaming BN for Lim's controversy.

"I advise these YBs to stop embarrassing themselves.

"Defending their master with lame excuses will only further weaken Lim's position as chief minister," Rahman said in a series of Twitter postings.

Rahman said it was not BN's doing that got Lim into the position he is in right now.

"It wasn't BN who forced Lim to buy the property and at such undervalued price. Stop blaming others.

“It wasn't BN who forced Lim to buy the property from this particular lady whose boss is the KLIDC (Kuala Lumpur International Dental Centre Sdn Bhd) owner.

"The timing, seller, and price of bungalow buy (were) not determined by BN," he said.

BN had accused Lim of purchasing his bungalow on Jalan Pinhorn at below market price in exchange for selling state land in Taman Manggis cheaply to KLIDC.

However, Lim had pointed out that the Taman Manggis land sale in 2012 was done through open tender and he was never part of the tender committee.

Lim also said that he was unaware of the bungalow's market value when he purchased the property last year.

However, Penang Umno Youth chief claimed Lim had declared to the Inland Revenue Board that the property was worth RM4.27 million based on a copy of the property transfer assessment declaration he obtained.

Rahman also poured cold water on Ng's assertion that Lim could not know the bungalow's market value as he was not a property valuer.

“According to Tanjong MP, Lim is an accountant not valuer.

“But funny thing is (the) chief minister seems to know the value of all other lands, except his house.

"Can Khir Toyo then say he didn't know the value of the house he bought just because he was a dentist?" Rahman asked.

Khir was, in September 2015, jailed for a year for purchasing his mansion at below market price in exchange for favours.