Also: Sanders can't guarantee that there isn't a tape out there of Trump using the n-word. And she can't guarantee that because there almost certainly is a tape out there of Trump using the -n-word. Take it away, CNN:

As President Donald Trump faced allegations of racism and cruelty on Tuesday, his press secretary stepped to the White House podium to deny only one of those charges... But her defense—that Trump has insulted people of all races, not just African-Americans—only underscored how the President and his aides have embraced his caustic attitude...

Asked Tuesday whether the President had ever used the N-word, Sanders would not definitively say, instead referring reporters to a tweet. "The President addressed that question directly," she said, adding: "I've never heard him use that term or anything similar." Pressed specifically on whether any recording of the President using the racial epithet exists, Sanders said: "I can't guarantee anything, but I can tell you that the President addressed this question directly."

What will happen if a tape of Trump using the n-word surfaces? Nothing, like David Roberts says...

I'll go ahead and predict that if a tape emerges of Trump saying the n-word, it will have virtually no effect and cost him no support. I base this on my "Republicans are always worsre than anticipated" principle, which hasn't failed in decades.
— David Roberts (@drvox) August 14, 2018

Trump's base—the GOP's base—will love it. It'll push his approval ratings among Republicans from 82% to 100%.