President Donald Trump said that it "should be formally announced sometime next week that we will have 100 percent of the caliphate."
"Iraq's constitution does not allow our territory of our country to be used against our neighbors," President Barham Salih said.
"It definitely rattled people," a former senior U.S. administration official told The Wall Street Journal. "People were shocked. It was mind-boggling how cavalier they were about hitting Iran."
Secretary of State Mike Pompeo argued that "America has always been a liberating force, not an occupying power, in the Middle East," but Syria would disagree.
A Japanese passport permits travel to 190 countries either visa-free or with a visa upon arrival. The weakest passport, by contrast, grants access to only 30.
The U.S.-built BGM-71 TOW saw more action in Syria than any other anti-tank guided missile. Now these weapons could be turned on their country of origin.
Responding to the top anti-ISIS official's resignation, President Donald Trump said he did "not know" him.
With the U.S. apparently on its way out, regional powers like Iran, Iraq and Turkey are looking to step up their involvement in Syria's multi-sided war.
"It was entirely inappropriate to use that as a point of a political rally," said retired Army General Barry McCaffrey.
Two leading rival blocs of the Iraqi parliament condemned Trump's visit as a "blatant violation of Iraqi's sovereignty," while Iran-backed militias called for U.S. troops to be ousted.
Major General Yahya Rahim Safavi said that "a dramatic shift of the global center of power is taking place now from the West to the East," where Russia, China, India and Iran would rule.
MSNBC's Joe Scarborough took issue with President Donald Trump seemingly inventing a huge pay raise for military members.
"What [presidents] don't do is politicize the event, and unfortunately, as we saw some of the commentary by the president today, that's exactly what he did," retired Lieutenant General Mark Hertling told CNN.
The comments were made one day after the president made a surprise visit to troops in Iraq.
"Trump's engaging in campaign activity during this trip is on Trump and Trump alone. Disgusting," Walter Shaub wrote.
"If you would have see what we had to go through in the darkened plane with all window closed with no light anywhere," Trump said. "Pitch black."
The visit came one week after President Donald Trump announced the withdrawal of U.S. troops from Syria.
Iraq and Syria both declared victory against ISIS late last year, but the jihadis have maintained a presence in the face of pro-government and U.S.-led airstrikes in the latter.
Iranian President Hassan Rouhani said "you will not be able to survive the debris of drugs, refugees and bombs and assassination" if U.S. sanctions hit.