"I will no longer keep secrets for them who actively seek to destroy the country," Warner said.
Warner also said in the address, which was a paid political advertisement, that "I reasonably actually fear for my life."
Still, a half-hour after the speech aired, Warner appeared at his Independent Liberal Party's rally held under a canopy on a residential street. At least a couple hundred people were present when Warner spoke, many of them having not seen the televised remarks.
Warner said he has documents and checks that link FIFA officials, including embattled President Sepp Blatter, to the 2010 election in Trinidad and Tobago.
"I apologize for not disclosing my knowledge of these events before," Warner said.
At his rally, a half-hour into his remarks, Warner — mopping sweat from his forehead several times — told supporters that he will not hold back in his newfound plan to expose scandal.
He said he has compiled reams of documents and is delivering them to his attorneys, for them to disseminate as they see.
"Not even death will stop the avalanche that is coming," Warner said as his supporters cheered in celebration. "The die is cast. There can be no turning back. Let the chips fall where they fall."
Warner also said that when he heard Blatter was stepping down, he wrote him to urge his immediate departure from FIFA.
"Blatter knows why he fell. And if anyone else knows, I do," Warner said.