Sometimes each of the big political parties does things intended to serve their own partisan interests instead of the nation as a whole. But in recent decades the Republican Party has become so extremely hyper-partisan that they have been violating the Constitution and constitutional principles in many ways (e.g., suppressing the voting rights of constituencies who favor Democrats and refusing to hold Senate hearings on Obama’s Supreme Court nominee Merrick Garland).
This article exposes Mitch McConnell’s cynical partisanship and rule-breaking. He thinks winning for partisanship is all that counts.
https://www.theguardian.com/commentisfree/2019/apr/06/mitch-mcconnell-senate-republicans-donald-trump-judges