On Friday's broadcast of CNBC's "Squawk on the Street," CNBC Contributor and Global Head of Commodity Strategy for RBC Capital Markets Helima Croft stated that "five years ago, we saw more significant sanctions enforcement" on Iranian oil, but "Now, we have Iranian oil at about a six-year high. And so, I do think the White House is now talking about potentially tougher sanctions enforcement in an effort to maybe get the Israelis to hold their fire."