As authorities search for accomplices in the attacks, France launched airstrikes against the ISIS base in Raqqa on Sunday night in retaliation for the suicide attacks that killed at least 129 people.
Since 2013, Raqqa has been bombed extensively by the United States, France, Russia and various Arab states, including Syria itself.
The U.S. and its allies should have also been hitting the terrorist funding streams on the oil and banking fronts, Trump told CNBC's "Squawk Box" in a phone interview Monday.
"I've been saying attack the oil for two years. People would laugh, and they'd scoff, and they'd joke," he said. "Now all of a sudden, they started attacking the oil because that's a significant source of their wealth."