I am not sure what context this is in, but great father and great chief could refer to a fatherly figure to Lewis, or it could be a religious reference such as a God/ the Lord?
Historically the press has had an adversarial relationship with the government.
The word adversarial here means a relationship that is full of a lot of conflicts, oppositions and anger.
The reason for this is because the press is often charged with revealing or exposing the ills, the weaknesses and the wrongs of the government.
The constitution of the country recognizes the freedom of the press. So it is difficult for most governments to try to control them.
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