Groan-inducing.

ISE CITY, Japan — President Obama said Thursday that world leaders have been surprised by Donald Trump’s emergence as the presumptive Republican presidential nominee and remain uncertain “how seriously to take some of his pronouncements.”

After a day of meetings at the Group of Seven summit in Japan, Obama said his counterparts are “rattled by Trump — and for good reasons — because a lot of the proposals he makes display an ignorance of world affairs or a cavalier attitude or an interest in getting tweets and headlines instead of actually thinking through what is required to keep America safe and secure and prosperous.”

Obama’s assessment of the GOP standard-bearer, in response to a question at a news conference, comes as the president has become more forceful in his criticism and increasingly willing to wade into the 2016 election cycle. The president also questioned Trump’s readiness for office during a commencement address at Rutgers University this month, although he did not mention the business mogul by name.