Matthew Kroenig

President Trump looks focused on two potential types of targets.

One is bigger, aimed at destabilizing or overthrowing a regime.

Another would be more limited, such as strikes against nuclear targets or the ballistic missile program.

Matthew Kroenig, a senior director at the Atlantic Council, says if he were advising the president, he'd suggest the latter.

Trump is not the first U.S.

president to deal with this issue.

Former President Barack Obama was widely criticized for the nuclear deal that he reached.

George W. Bush labeled Iran part of his axis of evil.

Franco Ordonez, NPR News.