He probably wants to remove that whole spiel about “LIFE, liberty, and the pursuit of happiness”.
It would make it easier for him to dispose of the unwanted and political enemies.
He wants to change it to “guarantee happiness”.
“We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable rights, that among these are life, liberty and the pursuit of happiness.”