Story highlights Trump has previously argued in favor of bombing oil fields in ISIS hands in Iraq

Trump has repeatedly railed against the 2011 U.S. decision to strike Libya as part of a multinational campaign

Fresno, California (CNN) Donald Trump on Friday suggested that the United States should bomb ISIS in Libya, a decision that would mark a serious escalation of the U.S. military campaign against the terrorist group. It's also a new position for Trump, who has argued both in favor of and against military intervention in Libya over the past five years.

Claiming that ISIS controls oil fields in Libya, the presumptive Republican nominee questioned during a rally here why the United States isn't "bombing the hell out of" ISIS in Libya.

"ISIS has the oil. And then you say if ISIS has the oil, why aren't we blockading so they can't sell it? Why aren't we bombing the hell out of --" Trump said, stopping short as he pivoted to slamming President Barack Obama as "grossly incompetent."

The U.S. has bombed ISIS in Libya, including a major strike on an ISIS camp back in February. The Pentagon recently acknowledged there is a "concept of operations" for Libya that includes continued airstrikes against ISIS targets when they can be located.

Trump has previously argued in favor of bombing oil fields in ISIS hands in Iraq -- where the U.S. already has several thousand troops -- but his remarks on Friday mark the first time the de facto Republican nominee has raised the possibility of a U.S. military campaign in another country.

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