Meanwhile, U.S. President Donald Trump declared he wanted U.S. troops to stay in Iraq "to watch Iran", during an interview with CBS. While the Kurds have proven themselves to be invaluable in the fight against ISIS in both Syria and Iraq, Turkey views all Kurds as terrorists because of the actions of an ethnically Kurdish militant group inside its own borders.
Further discussing the Syria withdrawal, Trump said the 2,000 troops are slowly beginning to leave the country while combating the "final remainder of the caliphate" and they will later "be going to our base in Iraq, and ultimately, some will be coming home".
He also stressed that "it is of fundamental interest for Iraq to have good relations with Iran" and other immediate neighbours.
"We might as well keep it", the president said.
"When I look at Iran, I look at it as a nation that has caused tremendous problems", he said.
Trump's remarks that come weeks after the USA president sparked outrage in Iraq by visiting United States troops at Ain al-Asad base without meeting a single Iraqi official, are fuelling renewed calls for the expulsion of U.S. forces.
He said the USA base in Iraq is "perfectly situated for looking at all over different parts of the troubled Middle East". Moreover, the power vacuum caused by the departure of US troops in Syria could be filled by ISIS or al-Qaeda in Syria or Iraq, according to USA intelligence chiefs.
Mr Saleh said on Monday that the U.S. had not asked Iraq's permission to do so.
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The ministry said it urged the U.S. to release them "at the earliest" and cautioned that some "may have been duped". This was done following an investigation by Homeland Security Investigations (HSI).
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Trump's comments added to concerns in Iraq about America's long-term intentions, particularly after it withdraws its troops from Syria.
The US decision to reimpose sanctions lifted under former president Barack Obama, as well as new measures targeting Iran's oil, banking and shipping industries has left Baghdad caught in the middle of growing tensions between its two biggest allies.
That would allow military leaders to maintain pressure on the armed group even as officials follow Trump's orders to withdraw some 3,000 troops from Syria.
He appeared to be referring to the Al-Asad air base in western Iraq, where he paid a brief visit to USA forces in December. Curbing foreign influence has become a hot-button issue in Iraq after parliament elections in May in which Shiite militias backed by Iran made significant gains.
Speaking about the crisis in Venezuela, Trump said US military intervention was "an option".
The United States has pressured Iraq to wean itself off Iranian natural gas, which generates almost half of Iraq's electricity, with promises of USA investment in the country's crumbling infrastructure.
"Guess what? Those intel people didn't know what the hell they were doing, and they got us tied up in a war that we should have never been in".