With an expertise in geopolitics, RBC Capital Markets' Helima Croft says Rex Tillerson's exit could create "very big implications" for the global oil markets.
Croft, who has held positions at the Council on Foreign Relations and the CIA, sees President Donald Trump's decision to tap Mike Pompeo as secretary of State as a bullish catalyst for oil prices.
According to Croft, Pompeo's appointment will likely be the "nail in the coffin" for the Iran nuclear deal and spur additional sanctions on Venezuela.
"Rex Tillerson had been a moderating influence in the Trump administration. He had argued for maintaining the Iran nuclear agreement. He argued against very tough economic sanctions on Venezuela," RBC's global head of commodity strategy said Tuesday on CNBC's "Futures Now." "With Pompeo, a known hawk taking the top diplomat job, I could see Trump easily making the decision to not renew sanctions waivers on May 12 effectively ending U.S. participation in the Iran nuclear deal."