CNN host Jake Tapper fact-checkedDonald Trump’s campaign advisor Jason Miller after he claimed the ex-president didn’t mock Joe Biden’s speech impediment, RadarOnline.com has learned. Tapper came prepared with receipts to disprove the Trump campaign’s claims on Thursday’s edition of The Lead. Tapper referenced a Washington Post article about Biden “embracing his stutter” while Trump openly “mocks it, exaggerates it, belittles it.” At a campaign rally in Georgia, Trump took his insults a step further when wondered aloud whether or not Biden would “bring the country t-t-t-together.” The report a…