I’ve heard Trump deliberately say some things he probably shouldn’t have; but I’ve never heard a ‘gaffe’. Trump always knows exactly what he’s saying, and means what he says.
Something Trump “probably shouldn’t have said”:
“Nikki Haley is in charge of security. We offered her 10,000 people, soldiers, national guards. Whatever they want. They turned it down”.
—Trump
Nancy Pelosi was the correct subject, not Nikki.
MSM didn’t flinch, but wait til November!