From FMT:
Do you have a problem, Najib asks Kit Siang in latest tit-for-tat

PETALING JAYA: The war of words between Najib Razak and Lim Kit Siang continued today, a week after the latter’s cancellation of a debate between them.
The former prime minister expressed surprise after Lim recalled several incidents in the past where he said Najib had avoided engaging with his critics.
“This man, does he have a problem?” asked Najib in a Facebook post.
“He was the one who gave the topic for the debate. He was the one who asked me if I would agree to the topic.
“He was the one who withdrew from it two days later, giving a racist excuse about a Chinese versus Malay conflict.
“He was the one who wrote at length on why he withdrew from the debate.”