Presumptive Republican nominee Donald Trump is going to be the next president of the United States, and things could get "pretty scary" in the short-term, according to Jeffrey Gundlach, chief executive officer of DoubleLine Capital.

Still, investors should look at any Trump-related market downturn as a buying opportunity, he said.

Gundlach, speaking with CNBC on Friday, emphasized that he does not support political candidates, but his analysis leads him to believe Trump — who lags presumptive Democratic nominee Hillary Clinton in recent national polls — will win the White House.



"People aren't getting along, they're not happy because of technology taking jobs, and sort of this long, slow grind of a new economy. And so they're looking for change, and I think Trump is going to win on the basis of that," Gundlach said on "Fast Money Halftime Report." "And he will be quite a bit like Ronald Reagan."