Judge Jacob Walker has scheduled a multiday hearing to begin Monday afternoon.
The powerful Republican is arguing that the state ethics law is unconstitutional and that prosecutors had a vendetta against him.
Defense lawyers intend to call two former attorney general office employees and the former head of the state ethics commission to the stand.
Hubbard faces 23 felony ethics charges accusing him of using his public positions to benefit his businesses.
The case is scheduled to go to trial March 28.
Prosecutors filed a motion Friday objecting to defense efforts to push back the trial, which has already been delayed once.
Republished with permission of The Associated Press.