JD(U) today gave first indications of parting ways with the NDA, saying it is "difficult" to remain in the alliance which is on "ventillator support" in the wake of resignation of L K Advani from top BJP posts and anointment of Narendra Modi as party's campaign committee chief for next Lok Sabha polls.

Terming Advani's resignation as a "serious issue" and "not good for NDA health," Janata Dal (United) president Sharad Yadav said his party, an NDA ally, will meet to review the latest developments.

"I am deeply saddened by the resignation of Advaniji. Because the NDA was forged with the efforts of Atalji and Advaniji. He (Advani) is also the working president and Atalji is not keeping well," Yadav said. "So his resignation in my opinion is a serious issue and we will convene our own party meeting to discuss the matter," said Yadav, who is also the convenor of the NDA.