The Democratic senator has pushed for Obama to seek authorization.
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The neurosurgeon said he would make a decision by May.
Richard Viguerie and Sean Hannity have called for a bolder platform.
Obama will deliver remarks at 10 a.m. from the White House.
Rubio called ISIS a "menace to all who value freedom and tolerance."
Republicans say voters should see the proposals before the midterms.
He will defend makers of "Call of Duty," which ex-Panama dictator says unfairly depicts him.
The committee announced the hearing after a fence jumper at the White House raised questions.
The car was parked blocks away.
"In my wildest dreams," he says, "I never imagined that someone could do what this guy did."