On the most high God and his son

 The God and Father of Jesus Christ is the most high God (human councils notwithstanding)

Psalms ch.83:18KJV"That they may know that thou alone, whose name is JEHOVAH, Art the Most High over all the earth."

Thus no one not numerically identical to JEHOVAH can be the God of Israel or the most high God

If the claim is that the triune God is JEHOVAH Then it logically follows that no one other than this triune God can be called JEHOVAH in as much as Jesus nor the Father are triune according Trinitarian orthodoxy then neither Jesus nor the father can be called the most high or the God of Israel

it is also claimed that no member of the trinity is a God there are not three gods but three persons.

So the fact that the father is called the God and one God is a problem because it means that the father is A God in his own right also the Father is the God of the son

Revelation ch.3:12 KJV" that overcometh, I will make him a pillar in the temple of my God, and he shall go out thence no more: and I will write upon him the name of my God, and the name of the city of my God, the new Jerusalem, which cometh down out of heaven from my God, and mine own new name. "

There fore the Son is definitely not the most high

Acts ch.3:13NIV"The God of Abraham, and of Isaac, and of Jacob, the God of our fathers, hath glorified his Servant Jesus; whom ye delivered up, and denied before the face of Pilate, when he had determined to release him. "

Luke ch.1:32NIV"He will be great and will be called the Son of the Most High. The LORD God will give him the throne of his father David,"

So the God and Father of Jesus is the Most High God I.e JEHOVAH