Bloomberg has said he will use his money against Trump even if hes not the nominee. That clearly has Trump worried. a recent example comes from Blomberg running a negative Trump ad (Trump doesn't care about mlitary) on . . of course, Fox & Friends:
https://dailycaller.com/2020/01/23/mike-bloomberg-trump-obsessed-much/
"Fox News’ flagship program “Fox & Friends” aired the ad Thursday morning, which likely led to Trump ripping on the former New York City mayor on Twitter."
You can read the whole story on the link, but suffice it to say it set off a Twitter spat that only gave Bloomberg that much bigger a platform to crush Trump again. In other words, he used Trump's formula against Trump
Could a billionaire left-leaning troll bring down a billionaire right leaning troll?