Is ABC News guilty of rigging the Trump vs. Harris debate by fact-checking Trump and not fact-checking Harris or was the debate conducted fairly?

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According to one source (see link), former Clinton advisor Mark Penn called for an investigation into ABC News for rigging the presidential debate against Trump.

See the following for comments and video:
www.thegatewaypundit.com/.../

I leave it to GAG readers to determine if the source, including the comments and video, is credible.
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The drunk off the street would have had better sense than Trump. Trump was foolish enough to agree to a debate and allow Harris to choose a biased network and biased moderators who aided her at every step. Therefore, of course, it was a rigged debate but Trump has no one except himself for agreeing to the debate. Trump should never allowed Harris to choose both the Network and the moderators.
Is ABC News guilty of rigging the Trump vs. Harris debate by fact-checking Trump and not fact-checking Harris or was the debate conducted fairly?
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