PS: Donald Trump was endorsed by former KKK leader David Duke and by the "Crusader" the official newspaper of the KKK.
Joe Biden was not.

And so? Trump has no control on who endorses him....

BUT....
SNIP
'THE INCONVENIENT TRUTH ABOUT THE DEMOCRATIC PARTY'

'Since its founding in 1829, the Democratic Party has fought against every major civil rights initiative, and has a long history of discrimination.

The Democratic Party defended slavery, started the Civil War, opposed Reconstruction, founded the Ku Klux Klan, imposed segregation, perpetrated lynchings, and fought against the civil rights acts of the 1950s and 1960s.'

SNIP
But after Reconstruction ended, when the federal troops went home, Democrats roared back
into power in the South. They quickly reestablished white supremacy across the region with measures like black codes ' laws that restricted the ability of blacks to own property and run businesses. And they imposed poll taxes and literacy tests, used to subvert the black citizen's right to vote.
And how was all of this enforced? By terror -- much of it instigated by the Ku Klux Klan, founded by a Democrat, Nathan Bedford Forrest'

assets.ctfassets.net - Swain the inconvenient truth about the democratic party transcript