By Tom Perry BEIRUT (Reuters) - Syrian President Bashar al-Assad said U.S. forces in Syria were "invaders" and he had yet to see "anything concrete" emerge from U.S. President Donald Trump's vow to prioritize the fight against Islamic State. Assad has said he saw promise in Trump's statements emphasizing the battle against Islamic State in Syria, where U.S. policy under President Barack Obama had backed some of the rebels fighting Assad and shunned him as an illegitimate leader.



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