I didn't see/hear the interview - it just strikes me that when some phrases that helve been used by many many folks over the decades, it's a huge jump to call i plagiarism because they show up in similar speeches some years apart. Michelle didn't coin the phrases and any rational person would know they are up for grabs by anyone who has a relevant place to use them.
So give me a link with this order of words- other than Melania and Michelle. Internet has 100s of millions of docs to search.
“values that you work hard for what you want in life. That your word is your bond. And you do what you say”