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Trump says others must fight in Syria

US President Donald Trump has defended his surprise decision to declare victory over Islamic State militants and completely withdraw US troops from Syria.

In a series of early posts on Twitter, Trump says he is fulfilling a promise from his 2016 presidential campaign to leave the Middle Eastern nation.

The US was doing the work of other countries, including Russia and Iran, with little in return and it was "time for others to finally fight", he wrote early on Thursday.

"Getting out of Syria was no surprise. I've been campaigning on it for years, and six months ago, when I very publicly wanted to do it, I agreed to stay longer. Russia, Iran, Syria & others are the local enemy of ISIS. We were doing there (sic) work. Time to come home & rebuild. #MAGA," Trump wrote on Twitter, ending with a reference to his "make America great again" catchcry.

"Does the USA want to be the Policeman of the Middle East, getting NOTHING but spending precious lives and trillions of dollars protecting others who, in almost all cases, do not appreciate what we are doing? Do we want to be there forever? Time for others to finally fight," he added.

Trump announced on Wednesday that he would begin withdrawing the roughly 2000 US troops from war-torn Syria, although the White House declined to offer a timeline.

Some of Trump's fellow Republicans fiercely criticised the move, saying they were not briefed ahead of time and that the move strengthened the hand of Russia and Iran, which both support Syrian President Bashar al-Assad.

US officials, speaking on condition of anonymity, have told Reuters that US commanders on the ground are also concerned about the impact of a quick withdrawal.