“Look! The true Lord, Jehovah of armies, Is chopping off branches with a terrible crash; The tallest trees are being cut down, And the lofty are brought low.”
~Isaiah 10:33

God has the power to bring down whomever he chooses.
Although he has for the most part left humanity to follow its own course, there are times when he has decided to remove or limit power from certain governors. (Eccl. 8:9)
For example, in ancient Israel, God’s angel put to death the Assyrian regime that had camped outside of Jerusalem. (2 Chron. 32:21; Is. 37:36)
God’s Word states that in the future, he will do away with all imperfect governments and only Christ will rule the earth from heaven. (Is. 9:6,7; Da. 2:44)
It does not matter how powerful a ruler thinks he is; in God’s eyes he is just a person who will eventually be put in his place. (Is. 7:9b; 8:12,13)