President Trump is just doing what any President would do: He is honoring the unofficial quota.
When a lady Justice leaves, that seat is filled with a lady.
When a person of color leaves, that seat is filled with a person of color.
In order to keep peace in this unusual nation, it is necessary to make sure that there is diversity if we want to maintain some semblance of order. Since the Euro American population is shrinking, it is understandable that the Court will eventually have a majority of non-Euro Americans.
That's how the cookie crumbles.