House Minority Leader Nancy Pelosi Nancy Patricia D'Alesandro PelosiHouse climate change panel GOP, Trump over spending deal MELSTER  President Trump Donald John TrumpObamaCare enrollment drops for a second under Trump Giuliani makes new defense of Stormy Daniels, Karen McDougal payments Pollster says Americans are willing to give Mueller space to conduct a 'thorough and full investigation' MORE 's decision to pull US Michael Flynn
"It is premature for the President to declare a sweeping victory against ISIS when, just A few weeks ago, our coalition-led airstrikes against targets in Iraq and Syria said, "Pelosi said in a statement."
"All Americans should be concerned National Security Advisor Michael Flynn, who admitted that he was a registered foreign agent for a country with clear interests in the Syrian conflict, said he added.
Flynn has failed to register as a foreign Robert Mueller Robert Swan MuellerSasse: US should applaud a choice of Mue ller to lead Russia sample MORE .
Flynn's attorneys indicated the retired general would have to testify in the case of his former associates, who allegedly conducted a secret lobbying
Trump's decision to withdraw US Turkish President Recep Tayyip Erdoğan threatened to launch a new assault against US-backed Kurdish forces in Syria.
U.S. Support for the Kurds has become a major point of tension in US-Turkey relations, as the NATO ally views the Syrian Kurdish forces as a terrorist group.
Pelosi, who is expected to be the Speaker of the next session of Congress convenes in January, pledged that House Democrats pledged that they would not be responsible for oversight on Trump's strategy in Syria.
"The American people deserve a smart, strong and strategic Syria policy that keeps America safe, protects our interests and advances peace in The region, "she said.
Trump has not commented on the decision to withdraw troops, but tweeted Wednesday morning that" We have defeated ISIS in Syria, my only reason for being there. "
The announcement appeared to catch US lawmakers and international allies off guard. Republicans expressed frustration with the decision, calling it a mistake and lamenting that there seems to be little communication about the strategy ahead of time.
Russia, which unlike the U.S. backs the Syrian government was in its long-running civil, applauded Trump's decision.