"My amendment would acknowledge the plain fact that al Qaeda*, ISIS[Daesh]**, and their affiliates in Syria and Afghanistan continue to pose a serious threat to our nation", McConnell said in remarks on the Senate floor.
McConnell said his amendment, which he plan to introduce to a wide-ranging Senate bill on the Middle East, would "recognize the danger of a precipitous withdrawal from either conflict, and highlight the need for diplomatic engagement and political solutions to the underlying conflicts in Syria and Afghanistan".
He stressed that his amendment would ensure the continued commitment of US forces until "vile terrorists" suffer an enduring defeat in both countries.
Moreover, McConnell emphasized that if the US exit the two countries before defeating the terrorists, the two conflicts would "reverberate in the United States".
McConnell said he would introduce the amendment to the "Strengthening America's Security in the Middle East Act", a sweeping package of measures that would impose new sanctions against Syria, boost defense spending in the region and punish activists who call for economic boycotts of Israel to protest its policies in Palestine, among other measures.
The bill cleared a first Senate hurdle on Monday in a 74-19 vote, and the chamber is expected to decide on the final version of the legislation in the coming days.
The White House, however, has dismissed the claims about Afghanistan, saying that Donald Trump had no such plans.
*Al-Qaeda is a terrorist group banned in Russia and many other countries.
**Daesh (also known as ISIS/ISIL/IS) is a terrorist group banned in Russia and many other countries.