Senate Democrats will hold a special caucus meeting on Wednesday with's former ISIS envoy as lawmakers weigh how to respond to the administration's Syria strategy.

He added that Democrats would "try to learn as much as possible from the experts available to us."

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McGurk, the former envoy in the fight against the Islamic State in Iraq and Syria (ISIS), announced late last year that he was resigning from the administration over Trump's decision to pull U.S. troops out of Syra. Trump subsequently reversed his decision.

McGurk has emerged as a vocal critic of Trump's decision earlier this month to pull back troops from northern Syria, paving the way for Turkey's military invasion.

"Donald Trump is not a Commander-in-Chief. He makes impulsive decisions with no knowledge or deliberation," he said in a tweet shortly after the White House announced the decision.