Trump won't attack Kamala Harris because of one reason that frightens the hell out of him: MSNBC panel
Sen. Kamala Harris (MSNBC)

MSNBC anchor Nicolle Wallace's panel on Thursday explained how President Donald Trump fears the huge crowd Sen. Kamala Harris drew to her campaign kickoff.

Harris drew an estimated 20,000 people to her campaign kickoff in Oakland, California.

For analysis, Wallace interviewed New York Times White House correspondent Annie Karni and Axios reporter Jonathan Swan.

"Kamala had the biggest start out of the gate with the huge crowds and has kind of stalled as [Joe] Biden got in and Bernie [Sanders] has this real core base of support," Karni noted.

"One other thing to note, in terms of her turning to Trump, I’ll be interested to see his reaction to her because she is notably one candidate in the wide field that he doesn’t seem to know how to take on or has settled on a way, he’s doing Sleepy Joe, Crazy Bernie, he made fun of Pete Buttigieg at his rally in Florida last night," she explained.

"All he said about her is she has commendable crowds. He hasn’t figured out a way to attack her yet," Karni concluded.

Wallace, who was a top Republican communications strategist prior to her journalism career, offered her analysis.

"Her crowds spooked him," Wallace concluded.

"In Trump’s mind, that’s the measure, that's the poll -- crowds don’t lie," Swan added.