Maggie Haberman explains what Trump doesn’t understand about the legislative process.

Despite naming a chief of staff who is expected to bring a new sense of discipline to the White House, President Trump resorted to his old Twitter playbook on Saturday, attacking Senate Republicans who he said “look like fools” — even as he demonstrated an uncertain understanding of the legislative process.

In a series of early morning messages, the president criticized the Senate’s filibuster rules, saying they were hampering his agenda.

Republican Senate must get rid of 60 vote NOW! It is killing the R Party, allows 8 Dems to control country. 200 Bills sit in Senate. A JOKE!

— Donald J. Trump (@realDonaldTrump) July 29, 2017

It was not clear why he was focused on the filibuster rule, a parliamentary delay tactic that requires 60 votes to overcome. Republicans have a 52-seat majority in the Senate. A proposal this week to repeal portions of the health care law, as long demanded by Mr. Trump, required a simple 51-vote majority to pass and still failed.

Nonetheless, Mr. Trump plowed on in the flurry of Twitter posts that started shortly after 7 a.m., saying “many great Republican bills will never pass,” including health care, under the filibuster rule.

In other words the head of state doesn’t understand the basics of his own government. The very basic basics.