POTUS said "King Elijah" in his tweet.

In the Bible, "1 Kings 18, Elijah defended the worship of the Hebrew God over that of the Canaanite deity Baal…. The Book of Malachi prophesies Elijah's return "before the coming of the great and terrible day of the LORD", making him a harbinger of the Messiah and of the eschaton in various faiths that revere the Hebrew Bible."

https://en.wikipedia.org/wiki/Elijah

POTUS saying "King Elijah" has to be significant because we know the Canaanites and Baal worshippers are involved in all this.

(And no, I do not think Elijah Cummings is righteous in any way. This may have just been a clever word play by POTUS.)