MAGA is Trump
Trump is MAGA
Get your facts straight: Trump borrowed “MAGA” from Reagan. Conservatism has always been about policy and agenda. Not Dear Leader populism.
“”Get your facts straight: Trump borrowed “MAGA” from Reagan. Conservatism has always been about policy and agenda. Not Dear Leader populism.””
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That was then, this is now and now... MAGA is, in fact, representative of Trump... as it was representative of Reagan when Reagan was in the WH.
And btw, you said that like it’s a bad thing, to have borrowed from Reagan, one of THE best presidents in US history. Why is that, I wonder....? Is “”Dear Leader populism”” only a bad thing to you if/when it’s a Republican?
Ronald Reagan's campaign themes in 1980 included: 
In 1984, Reagan's campaign themes were:
By stark contrast, MAGA is Trump's major theme and purpose, carried forward through three presidential elections and their mid-terms over the past 10+ years.
It was not just one & done, it's been his slogan and focus from Day One.
So, MAGA absolutely belongs to Pres. Trump -- it's his to define and to accomplish.
Any future candidates & administrations claiming the MAGA mantle will be judged by how closely they follow Trump's definitions of what MAGA is & should be.
Yes, of course, if you wish to claim that MAGA is not truly conservative according to your definition of "conservative", that's an argument you can make -- you can easily claim, "we are the true conservatives" (if indeed you really are), but you cannot claim "we are the true MAGA", because that term belongs to Donald Trump -- it's his to define and to bestow on loyal supporters.
If you're not one, then you need your own slogan, it's can't be MAGA.