Mormons teach that Jesus was Jehovah in the Old Testament. yet Jesus was with the Father and and explained the following:
John 5
19 Then answered Jesus and said unto them, Verily, verily, I say unto you, The Son can do nothing of himself, but what he seeth the Father do: for what things soever he doeth, these also doeth the Son likewise.
20 For the Father loveth the Son, and sheweth him all things that himself doeth: and he will shew him greater works than these, that ye may marvel.
John 12
27 Now is my soul troubled; and what shall I say? Father, save me from this hour: but for this cause came I unto this hour.
28 Father, glorify thy name. Then came there a voice from heaven, saying, I have both glorified it, and will glorify it again.
29 The people therefore, that stood by, and heard it, said that it thundered: others said, An angel spake to him.
30 Jesus answered and said, This voice came not because of me, but for your sakes.
Isaiah 44
8 Fear ye not, neither be afraid: have not I told thee from that time, and have declared it? ye are even my witnesses. Is there a God beside me? yea, there is no God; I know not any.
Isaiah 46
9 Remember the former things of old: for I am God, and there is none else; I am God, and there is none like me,