When Mitt Romney traveled to Europe as a presidential candidate in 2012, he created an uproar when he wondered aloud whether London was sufficiently prepared to host the Summer Olympics. British tabloids derided him as “Mitt the Twit” and CNN declared: “Romney’s Trip Begins in Shambles.’’

When Gov. Chris Christie of New Jersey went on a trade mission to Britain, he was roundly criticized for an errant comment about vaccinations amid a measles outbreak back home. “A Vaccine for Gaffes? Chris Christie Needs It” was the headline in Commentary.

Those moments seem quaint when compared with Donald J. Trump’s news conference in Turnberry, Scotland, a day after Britain voted to leave the European Union. Over the course of 40 minutes, the presumptive Republican presidential nominee made pronouncements, predictions and asides that would have set off serious backlash for almost any other candidate.

But Mr. Trump seems to be graded on a different curve. Here are some of his more provocative remarks:

He defended Vladimir Putin.

A reporter asked Mr. Trump about the suggestion from some pundits that both he and the Russian president, Vladimir V. Putin, would be the biggest political beneficiaries of the “Brexit” vote. Mr. Trump agreed that Mr. Putin could gain, and could not resist pointing out that Mr. Putin has been kind to him.