• “Save your energy Rex.”

President Trump undercut Secretary of State Rex Tillerson on Sunday, saying he was “wasting his time” by opening lines of communication with North Korea.

Some analysts wondered if the president was intentionally playing bad cop to Mr. Tillerson’s good cop. Veteran diplomats struggled to find a precedent.

• In Spain, the only certainty is uncertainty.

Leaders in Catalonia plan to present the results of Sunday’s independence referendum to the regional Parliament to make them binding.

Both sides claimed victory after the chaotic voting. The regional government said 90 percent of voters had approved the measure, which officials in Madrid said had been successfully disrupted.