The Bible explicitly teaches us to pray for our leaders ..... and as Paul taught, prayer should be "without ceasing" (1 Thessalonians 5:17). Prayer isn't something we as Christians should "restort" to in need, in hard times, it's a constant part of our intimate relationship with the Lord.
We must remember as Christians that the Bible tells us that all authority is put in power by God (Romans 13:1-8), AND that we are to pray for those in authority (1 Timothy 2:1-2) - kings, presidents, governors, etc.
God's word also teaches us that He uses kings/governments as instruments to punish His children. He did it to Israel & Judah. In fact, I was surprised to read in Isaiah 45:1 God Himself referring to King Cyrus of Persian (a pagan king who took Judah into Babylonian captivity) as God's "anointed", meaning he was doing God's work by punishing His people. The original word in the Hebrew is Strong's H4899
If that doesn't surprise you, it should!
God never leaves us wondering, He tells us exactly why He did it.............. "I am the LORD, and there is no other; Besides Me there is no God I will gird you, though you have not known Me; That men may know from the rising to the setting of the sun That there is no one besides Me.I am the LORD, and there is no other"