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... The increasingly unpopular war in Iran that has kept oil prices high, Trump's approval rating low and sent shock waves through the global economy? Actually, this was Trump making up for timid earlier presidents who, he argues, squandered nearly 50 years of opportunities to curb Tehran's nuclear ambitions.

Pithy slogans aside, all modern presidents shift responsibility onto others to some degree, frequently blaming the commander-in-chief who preceded them, Congress -- or both. But Trump has taken it to a new level, effectively embracing a de facto political strategy of being in charge of everything but responsible for nothing when things go badly.

"Taking responsibility being a characteristic of presidential leadership -- or any kind of leadership -- is absolutely true," said Nicole Anslover, a history professor at Florida Atlantic University and author of "Harry S. Truman: The Coming of the Cold War."

Trump's tendency to point fingers at others is increasingly in the spotlight before November's midterm elections, when Republicans are trying to retain control of Congress. His unwillingness to accept blame sometimes leads him to deny that there are problems at all, and could leave GOP leaders in tight races with little reassurance for voters that their concerns are being addressed. ...