Umno acting president Ahmad Zahid Hamidi refused to comment on Tengku Razaleigh Hamzah's challenge to a debate when asked by reporters.

Zahid also refused to address other issued raised by the press when met at the Putra World Trade Centre in Kuala Lumpur today.

On Tuesday, Umno veteran Tengku Razaleigh Hamzah challenged Zahid and youth chief Khairy Jamaluddin to a party presidential debate.

Khairy has stated that he is prepared to accept his rival's challenge.