I think it's a lot more complicated than that though. Trump massively gained with Hispanic voters and probably blacks and Asians too in the 2020 election, groups. So even though he may have heavily relied on non-Hispanic white voters in the Midwest, in his four years, he really started to rebuild the Republican Party as a working-class populist party.

The number of "white supremacists" in the US is vanishingly tiny, and the "progressive" left's attempt to associate Trump voters with this small group probably ended up doing more harm than good, tarring the entire Democratic Party, which previously had represented working class-whites as late as Obama's reelection in 2012, as being a party that despised the working class whites as "white supremacist". It also apparently didn't impress black, Asian, and Latino voters, who didn't appear to become more Democratic-leaning after Trump's election. Rather, it appears to have only been well-received among the Democrats growing "progressive", white collar base that's concentrated in a few, mostly coastal metropolitan areas. And that's likely why, if trends continue, Republicans are headed toward a supermajority in the Senate. That's probably one reason why McConnel has no interest in getting rid of the filibuster. Within the next decade, there's a good chance that Republicans will have enough Senators to pass legislation no matter what the opposition party thinks.

He was really the last WASP President. His son maybe started out that way, but 9/11 took everything in a very different direction and then after two failed bids for the White House, Trump came out of nowhere and remade the Republicans as a working-class populist party.