Earlier today, CNN's Jake Tapper reported White House officials believe President Trump was infected on Saturday, Sept. 26, at the Judge Amy Coney Barrett ceremony held three days before last week's debate. "The timeline surrounding President Trump’s contracting of the coronavirus, and his subsequent announcement of it, raises an urgent question," says Greg Sargent. "How is it conceivable that we’d proceed with the next presidential debate on Oct. 15 without full transparency on both this timeline and the actual state of Trump’s health? The unsettling fact of the matter is that we don’t know when Trump last tested negative. And, with White House officials refusing to answer this question, it’s reasonable to wonder whether we can trust anything more they say on the state of his health going forward." Sargent adds: "We know Trump tested positive late on Thursday, Oct. 1, and announced his positive test early on the morning of Friday, Oct. 2. But the White House won’t say when he last tested negative. This raises the possibility that Trump might have tested positive before the Sept. 29 debate, failed to disclose it and showed up at the debate anyway. At the least, we can’t rule this out. How can subsequent debates go forward under such conditions?" ALSO: Trump campaign trolls Kamala Harris with a debate ticket tonight for Tupac Shakur.