These days Donald Trump and Mike Bloomberg can best be described as mortal enemies.

The former New York mayor’s campaign against the president is leveraging Bloomberg’s deep pockets to oust his fellow Manhattan billionaire. Bloomberg has hired hundreds of staffers and organizers across 30 states. Bloomberg’s ads are ubiquitous on TV and his campaign has reserved a 60-second spot during the Super Bowl with an estimated price tag of $10m.

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The Trump campaign, in an illustration of the arms race a general election matchup between Bloomberg and Trump would be, announced its own $10m Super Bowl ad reservation after Bloomberg.

On Monday, Bloomberg and Trump squabbled on Twitter, with Trump dinging the former New York mayor on healthcare, calling him “Mini Mike”. In response Bloomberg corrected Trump’s false claim that his administration protected the pre-existing conditions provision of Obamacare.

And recently, the financial news website Marketplace published a scathing op-ed by Bloomberg with the headline “Trump has been great for people like me – but I’ll be great for you”.

But it wasn’t wasn’t always like this.

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