Immigration

Could be the issue that loses 2020 for the Democrats. 

It was the issue that cost them 2016 and they haven't changed their tune a bit.

The most powerful thing Trump said in the campaign, I’d argue, was: “If you don’t have borders, you don’t have a country.” And the Democrats had no answer, something that millions of Americans immediately saw. They still formally favor enforcement of immigration laws, but rhetorically, they keep signaling the opposite. Here is Dylan Matthews, also in Vox, expressing the emerging liberal consensus: “Personally, I think any center-left party worth its salt has to be deeply committed to egalitarianism, not just for people born in the U.S. but for everyone … It means treating people born outside the U.S. as equals … And it means a strong presumption in favor of open immigration.” Here’s Zack Beauchamp, a liberal friend of mine: “What if I told you that immigration restrictionism is and always has been racist?” Borders themselves are racist? Seriously?

Drawing borders, or boundaries is what healthy, normal people want and need to function in life.