Two problems with what Trump's claim of authorship..
First, the term "
America First" was a political slogan developed and widely used by Woodrow Wilson more than 100 years ago when he pledged to keep the USA out of WWI. It was later adopted by the KKK. Then by pro-Nazi U.S. groups who wanted to keep the USA out of WWII. And finally, it was used by Pat Buchanan in the 1990s. Trump copied it from Buchanan. Trump did not invent it. Make up your own mind about similarities between Trump and those who used the term before him.
Second, Trump is today reversing the meaning he applied to the term as a candidate, when the used the term to mean that he would not involve the US in foreign wars. Make up your own mind about similarities between Trump and the President who invented the term 100 years ago.