The best argument is just sticking to out of all the counties in the country, where Trump won 3,084 of the 3,141 counties in the election.
The actual county numbers were 2,626 counties for Trump and 487 counties for Clinton in the 2016 election.
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I relied on some link I found. I should have double checked,
Yet, even with the corrected numbers the argument still holds.
2,262 counties versus 487 counties demonstrates representation over a much greater share of the country.