When Chuck Schumer and Mitch McConnell agree on so many issues, there is indeed a uniparty on those issues.

Very often, Mitch & Chuck hold the same position on an issue, which is exactly in line with donors, and exactly opposite to the preferences of a majority of voters. That is one description of what it means to have a uniparty.

Perpetual wars, open borders, unrestricted trade with low wage nations, government censorship of media, killing Social Security (though it will never happen, they will keep trying), donor control of party nominations and government policies - these are examples of uniparty positions.