Bersatu deputy president Mukhriz Mahathir has not ruled out setting his sights on the prime minister's post, arguing that all politicians aspire to rise up the hierarchy.

However, the son of former premier Dr Mahathir Mohamad told the Kuala Lumpur High Court this morning that it must be done in the proper manner.

"Everyone in politics has the intention or wish to be a leader, including to be prime minister.

"However, such an intention or wish must be pure-hearted due to the huge responsibility (which comes with the position)...