Democratic strategist Matt McDermott on Saturday fact-checked an effort by Republican operatives to claim Donald Trump did not walk back a specific agreement to debate Vice President Kamala Harris on Sept. 10 on ABC News. Donald Trump on Friday challenged Harris to a Fox News-hosted debate on Sept. 4 and claimed the Sept. 10 ABC News debate “has been terminated in that [President Joe] Biden will no longer be a participant.” McDermott pointed out ” the ABC News debate is not ‘terminated,’” and argued Trump “is actually afraid of debating” Harris. READ MORE: Inside Trump’s ‘untested’ swing state…