Say what you want about Donald Trump, but he has an instinctive knack for zeroing in on an opponent's inherent weakness.
With Jeb, it was "low energy." That term exploited a key perception problem of Jeb, and one he couldn't shake. So too did "Little Marco," which may have ended not only Marco Rubio's presidential campaign, but his political career -- it's a term I just can't shake from my current perception of Rubio, and I suspect that a decade from now his political opponents will be referring to him as Little Marco.
As to Hillary, Trump went straight for her supposed strength -- supporting women and women's rights -- by zeroing in on Bill Clinton's serial abuse of women and Hillary's silence or connivance.
Now comes Elizabeth Warren, who harshly criticized Trump this week. Trump's response zeroes in on Warren's key perception problem, that she dishonestly claimed Native American, and specifically Cherokee, heritage for professional purposes. The research on Warren's Cherokee problem is at
Elizabeth Warren Wiki.
Trump is quoted by Maureen Dowd in a column at the NY Times,
Will Trump Be Dumped?, responding to Warren's criticism, as follows: