Expressing regret over the incident, Datuk Seri Ahmad Maslan (BN-Pontian) said although it is just an act of vandalism, it has huge implications.
"I feel that the Shah Alam City Council (MBSA) should take immediate action against those involved," he said during the debate on the motion of thanks on the Royal Address.
Ahmad Maslan, who is Umno secretary-general, said he hoped that authorities would secure the CCTV recording of the culprits vandalising the murals.
"Regardless of time and whoever they are, action must be taken against them," he said.
Foreign Minister Datuk Hishammuddin Hussein said the vandalism has insulted the King and is unforgivable and irresponsible.
"Respect the leaders and appreciate the painters who have painstakingly painted and created the art pieces," posted the Sembrong MP on his Twitter account.
It was reported that the murals depicting the King and several others were found to have been vandalised with bad words sprayed on them.
The murals at Section U12 Shah Alam were painted earlier this month by three friends - Muhammad Suhaimi Ali or Miey Ali, 27, Abdul Hadi Ramli, 27, and Muhamad Firdaus Nordin, 26 - and the pictures had since gone viral on social media.
Besides the King, other public figures painted on the wall of a building there included Prime Minister Tan Sri Muhyiddin Yassin, PAS president Datuk Seri Abdul Hadi Awang and Health director-general Datuk Dr Noor Hisham Abdullah.