Why not? I'll start with John 14:8-10
Scriptural support for the triune nature of God, and the gradual recognition that Jesus Christ, the Word incarnate (John 1:1), was and is God, can be found throughout the Bible. The evidence is abundant and unfolds like a flower, foreshadowed in the Old Testament and revealed in the New Testament. The evidence is explicit and implicit as the following discussion of some of the many supporting scriptural verses illustrates.
21) Phillip said to Jesus, "Show us the Father" - (John 14:8-10)
One of Christ’s most emphatic declarations that he was, and is, God, is found at John 14:8-10.
Phillip said to him, “Lord, show us the Father, and we shall be satisfied.” Jesus said to him, “Have I been with you so long, and yet you do not know me, Phillip? He who has seen me has seen the Father; how can you say, ‘Show us the Father’? Do you not believe that I am in the Father and the Father in me?”
Any claim by the Jehovah's Witnesses that Jesus thought of himself here as nothing more than a man is absurd. Of course, the Jehovah's Witnesses argue that Jesus could not have meant this because Jesus could be seen but God is an invisible spirit and no one has seen God at any time. Therefore Jesus could not be God. But again they fail to understand the two-fold nature of the divine person of Christ, the hypostatic union, and the indwelling of the Persons of the Trinity (see section 5). It is not the created humanity of Christ that is the Father. Jesus was referring to the divine person who assumed a human nature when He answered Phillip, and in this Person dwelt the fullness of the Godhead (Colossians 2:9).