New York Times, reporting on a meeting that took place last month between Tim Cook and other tech executives and FBI Director James Comey Jr., Attorney General Loretta Lynch, and other national security officials:

“With all due respect,” Mr. Cook told those around the table, including Mr. Obama’s counterterrorism chief and the heads of the National Security Agency and the Department of Homeland Security, “I think there has been a lack of leadership in the White House on this.”

Denis R. McDonough, the president’s chief of staff, took exception and said so. Law enforcement officials described him as stung by what they called Mr. Cook’s “rant,” although tech executives in the room insisted that Apple’s chief executive was respectful.

Either way, what started as a cordial two-hour discussion about combating Islamic extremism ended with the White House and Mr. Cook agreeing to disagree — foreshadowing a bitter battle between a president long enamored of Apple products and Silicon Valley and a tech titan who has spoken enthusiastically of Mr. Obama.

This divide might have been inevitable, but this looks like a core moment when the discussion moved from amiable to adversarial.