This is the second avoidable calamity to befall Mr Trump’s administration during its first month in power.
Unfortunately, the impression already created by his White House tenancy suggests a dangerous pattern, one driven by incomprehension around how government works but utterly untroubled by uncertainty.
The Flynn resignation was not unexpected. Sally Yates, who was fired for defending America’s constitution, warned the president some weeks ago that Flynn was susceptible to a Russian blackmail threat.
It is not difficult to imagine that Mr Trump might fantasise about a second term but the attacks being launched by his supporters in the Senate and the media against Senator Elizabeth Warren, a plausible Democratic rival in four years, suggest that Trump’s Praetorian guard realise that even he can only survive so many calamities.