The structure is what is most questionable. The words do not match up 100%.
But to me it is no big deal. Doesn’t change how I feel about voting for Donald J. Trump. He will become our 45th President.
To me only the last small section is even close. Otherwise it’s general words everyone uses.
Since 1801 the motto of the London Stock Exchange has been “dictum meum pactum” which is Latin for “My word is my bond”. The American actor Melvyn Douglas who died in 1981 said “Your word is your bond”.
It appears that Michelle did some plagiarism of her own and if you believe that then Melania hijacked a thief. This old saw has been around for 200 plus years.