The Senator’s demand comes after last week's revelation that US equipment provided to American-trained Syrian rebel fighters was now in the hands of al-Qaeda.
After initial, forceful denials last week that any of the approximately 70 in the second class of rebels had lost any of their equipment, US Central Command said on Friday that the unit had handed over six pick-up trucks and a portion of their ammunition-amounting to "roughly 25 percent of their issued equipment."
The revelation is the "latest indictment of a program that was destined to fail at the start," Murphy said in a statement on Monday.
"In the wake of this disturbing news, I believe the United States should suspend the program’s operation to ensure that it does not simply become a means of supplying extremist groups like al-Qaeda with American weapons and equipment."
This news is confirmation that US policy may unwittingly be furthering this catastrophic endgame, he added.
The administration created the Syrian rebel train-and-equip program last year, and Congress seeded it $500 million in December. Its purpose was allegedly to create a ground force against ISIL, and avoid the use of US troops.
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