Syrian legislator Faysal Kalthoum said late Monday that Damascus would reject the UN committee's request to interview Assad if it violates the dignity of the presidency.
"This request must not contradict the constitutional and legal rules surrounding the dignity of the presidency, the symbol of sovereignty and national dignity," he told AP. If it does, it will be rejected by all Syrians, he said.
The commission asked to interview Assad in July last year but was refused.
The US ambassador to the United Nations, John Bolton, urged Syria to comply.
"We strongly support the commission's investigative efforts," Bolton said in a statement Monday. "We expect the government of Syria to comply with these requests fully and unconditionally as the Security Council resolutions require."