Here's what I think is the important paragraph:
The conventional wisdom among the still sizable group of Trump-skeptical establishment Republicans in Washington is that Republicans on the ballot can somehow separate their fate from that of Trump in 2020. Some high-level Republicans have said on background that they hope to create a path to a split ticket, where anti-Trump suburban voters vote for the Republican Senate candidate while voting for Joe Biden and his running mate. They think they have a clever solution to the problem posed by having a president popular with Republican voters and opposed by the media and others.
That should tell you all you need to know about Trump's travails in draining the Swamp--or even bringing it to heel. The Senate advises and consents to key Deep State nominations. Trump was extremely fortunate in getting Bill Barr to take on the AG position. Barr had the nearly unique combination of establishment creds but a principled commitment to justice, wherever that might lead.