Disruption on the global stage, he added, is nowhere near the level seen at the start of the term.
Few recent leaders have shown that contradiction as sharply as Trump, according to the interview.
Trump remains commander-in-chief, still holds the tools of the executive branch and still commands extraordinary media attention.
Bremmer argued those advantages are translating less and less into effective political results.
Bremmer drew a distinction between institutional authority and political influence.
He pointed to a domestic shift, saying that only two years later the country had seen"the biggest loss in 50 years."."Those foreign leaders will start to engage more with the America that they expect to deal with after Trump is gone,"he said. In American politics, he said, holding presidential power does not guarantee the ability to use it.
The political scientist said the claim does not mean Donald Trump has become powerless. International leaders, Bremmer said, increasingly treat the administration as having a short political horizon.