No, the Threat to U.S. Interests Need Not Be 'Imminent' for POTUS to Use Force Unilaterally

In "Democrats Question Trump's Urgency to Attack Iran," New York Times reporter Minho Kim asserts:

The lawmakers questioned whether the United States faced an "imminent" threat from Iran, an assertion Mr. Trump made on Saturday, and a legal requirement for the president to initiate military action without congressional authorization. [Emphasis added.]

There is no such legal requirement. And I say this as someone who has repeatedly argued that the Constitution's default position is that the president must seek congressional authorization prior to using force...