Even if 20 GOP Senators somehow flipped on Trump and he was removed from office, he's already appointed 25% of sitting US circuit court judges, not to mention given us a conservative Supreme Court - after Senate Republicans stalled in 2016 on confirming Obama's choice to replace the late justice Antonin Scalia, Merrick Garland.

According to the Washington Post:

Trump nominees make up 1 in 4 U.S. circuit court judges. Two of his picks sit on the Supreme Court. And this past week, as the House voted to impeach the president, the Republican-led Senate confirmed an additional 13 district court judges.

In total, Trump has installed 187 judges to the federal bench. -Washington Post

And as the Post notes, "Trump's mark on the judiciary is already having far-reaching effects on legislation and liberal priorities."