Loyalists of ousted President Ali Abdullah Saleh, who form the majority in parliament, are at loggerheads with President Abed Rabbo Mansour Hadi.
They accuse Hadi of backing UN sanctions against Saleh and allied rebel leaders and had called on the government to explicitly denounce them. The government, headed by Khaled Bahah, has not.
In Tuesday's session, the official said ruling party members didn't openly decline to vote for the government program. Instead, disputes broke out about internal party affairs, forcing the speaker of the house to call off the session.
The official spoke anonymously because he wasn't authorized to brief reporters, AP reported.