The two Donalds couldn’t be more different. Donald Rumsfeld, the consummate foreign policy heavyweight, is able to parse nuance and cite historical precedents. And Donald Trump, the plain-speaking billionaire businessman, tends to make ambitious pronouncements with details to come.

Rumsfeld says NATO may be the greatest military alliance of all time. Trump thinks NATO may be irrelevant. Both are polarizing figures, and you’d be forgiven if you assumed they were also polar opposites. But while Trump may lack Rumsfeld’s deep national security resume, Rummy’s OK with that. And if Trump’s the GOP nominee, he’s got Rumsfeld’s vote.