The modern Trump version is: "If a president does something which he believes will help him get elected in the public interest, that cannot be the kind of quid pro quo that results in impeachment." - Trump's legal defense during his first impeachment.
"It depends on what the meaning of the word 'is' is"
Clinton, being a lawyer, asked for a definition of "sex". The definition given to him did not include oral sex. When a lawyer asks you for a definition of a word, then you are getting screwed.