2. A Senate hearing meant to be a long-awaited discussion of border walls turned into an impromptu interrogation about the words President Trump used — or did not use — last week to describe African countries.

“I don’t dispute that the president was using tough language,” said Kirstjen Nielsen, the Homeland Security secretary, above, but she denied hearing Mr. Trump call African nations “shithole countries.”

The Trump administration, meanwhile, bolstered its hard-line immigration stance with a report that concluded that three out of four convicted terrorists in the U.S. were foreign-born. Ms. Nielsen called the data “truly chilling.” But the statistics were notable as much for what they did not contain as for what they did.

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