Is it do diligence or due diligence?
It’s “due diligence” when you mean “the careful verification of information” or “the reasonable care taken to avoid harm to others.”
For example, “The company did its due diligence before agreeing to the merger,” or “The defense is arguing due diligence with respect to safety protocols.
“Due” and “do” are homophones, and this can lead to mistakes like this one of people mixing up due to and do to. QuillBot’s Grammar Checker can correct any mistakes with these phrases.