Lindsay Graham Calls for Immediate Hearings on Trump's Syria and Afghanistan Decision, Warns of Second 9/11

President Donald Trump's decision to withdraw U.S. troops from Syria and Afghanistan has aroused the ire of his fellow Republicans.

Trump's longtime ally Senator Lindsay Graham of South Carolina called for immediate hearings on Friday about Trump's military decisions regarding Syria and Afghanistan.

"The conditions in Afghanistan—at the present moment—make American troop withdrawals a high-risk strategy," Graham tweeted Friday. "If we continue on our present course we are setting in motion the loss of all our gains and paving the way toward a second 9/11."

Meanwhile, Republican Senator Ben Sasse of Nebraska slammed the decision as "weak."

"Eight days ago the Administration called a hypothetical pullout 'reckless.' Today, we're leaving. The President's generals have no idea where this weak decision came from: They believe the high-fiving winners today are Iran, ISIS, and Hezbollah. The losers are Israel, humanitarian victims, and U.S. intelligence gathering. A lot of American allies will be slaughtered if this retreat is implemented," Sasse said in a statement Friday.

On Friday, officials in Turkey suggested that they would take over the fight against the Islamic State, but Ankara is also locked in a bitter battle with the Kurdish forces the U.S. supports, and which have been instrumental in the fight against ISIS.

Even the conservative think tank the Heritage Foundation, which is traditionally supportive of the administration, released a statement opposing the move.

"Announcing force reductions without explaining to Americans how the administration plans to follow through on the excellent national security strategy the president laid out to the American people last year represents a significant failure in leadership," the foundation said in a statement Friday.

Trump announced on Wednesday that the U.S. would remove the estimated 2,000 troops it has stationed in Iraq because, according to the president, the Islamic State terrorist group has been defeated.

Experts were quick to point out that the group continues to have tens of thousands of adherents in Syria and Iraq.

"Even after the territorial defeat of ISIS and Al-Qaeda in Syria and Iraq, the threat from jihadist terrorists will persist. ­They have used battlefields as test beds of terror and have exported tools and tactics to their followers. Many of these jihadist terrorists are likely to return to their home countries, from which they can continue to plot and launch attacks on the United States and our allies," said the Trump administration's National Security Strategy, which was published in December last year.

Following Trump's decision on the future of U.S. troops in Syria and Afghanistan, Secretary of Defense James Mattis announced on Wednesday night that he would be stepping down in February.