The office of Iraq's prime minister, Adel Abdul-Mahdi, is not saying whether he has accepted President Donald Trump's invitation to visit Washington.

The two spoke by phone on Wednesday evening during Trump's unscheduled trip to visit American troops stationed at an air base in western Iraq. The president left approximately 3 hours later without meeting any Iraqi officials.

Abdul-Mahdi's office said in a statement that "differences in points of view over the arrangements" prevented the two from meeting face-to-face, but they discussed security issues and Trump's order to withdraw U.S. troops from Syria over the phone.

The White House said security concerns and the short notice of the trip prevented them from meeting.

The prime minister's office said the Iraqi leader invited the president to visit Baghdad, and Trump invited Abdel-Mahdi to Washington. But it did not say whether Abdel-Mahdi accepted the invitation, even though White House press secretary Sarah Huckabee Sanders said earlier than he did.

The head of one of two main blocs in Iraq's Parliament earlier denounced Trump's unannounced visit, calling it a "blatant violation of Iraq's sovereignty."

Sabah al-Saidi said  he was calling for an emergency session of Parliament to discuss Trump's visit Wednesday evening.

Al-Saidi, who heads the Islah bloc, said "the American occupation of Iraq is over." He said Trump should not be allowed to arrive "as if Iraq is a state of the United States."

Iraq's government has close military and diplomatic ties with Washington, though few parties want to be seen as overly close to the U.S. The Islah bloc is considered closer to the U.S. than the rival Binaa bloc, which espouses close ties with Iran.