That was then-Progressive-Democratic Party Presidential candidate Joe Biden’s go-to phrase whenever he wanted to emphasize his seriousness in making a claim.
Here’s one of those serious statements:
If you’re ever working with me and I hear you treat another colleague with disrespect, talk down to someone, I promise I will fire you on the spot. On the spot, no ifs, ands, or buts[.]
When White House Deputy Press Secretary TJ Ducklo was abusive to a Politico reporter, he was suspended for a week without pay and barred from interacting with Politico reporters.