Sen. Cory Booker says $6 billion in Iranian oil assets is "frozen": "A dollar of it has not gone out"

Sen. Cory Booker told "CBS Mornings" on Friday that $6 billion in Iranian oil assets that were freed up as part of last month's U.S.-Iran prisoner swap are "frozen."

"A dollar of it has not gone out," said Booker, who serves on the Foreign Relations Committee and was in Jerusalem when Hamas launched its large-scale attack. He said senators have received "assurances" the money has been frozen. 

Booker's remarks came after a source told CBS News on Thursday that the U.S. had reached a "quiet understanding" with Qatar not to release any of the $6 billion. According to the source, Deputy Treasury Secretary Wally Adeyemo informed House Democrats of that understanding in a closed-door meeting Thursday morning and said the money "isn't going anywhere anytime soon."