Speaking in Monroe, Michigan, the Senator denies his campaign is behind rumors about Sarah Palin's youngest child.
"I am offended by that statement. There is no evidence at all that this involves us."
Vows to fire any staffer found to be spreading the rumor that Trig Palin is actually the son of Gov. Palin's daughter.
Read press avail transcript here, and listen to audio here.
Also notes that his own mother had him when she was 18, and tells reporters to "back off" the story, reports TIME's Jay Newton-Small.
"I have said before and I will repeat again: People's families are off limits."
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