Donald J. Trump requires a lesson in government. Yep, the president of the United States does not understand how many things work.

Take the special counsel hired by the U.S. Department of Justice to examine the president’s potential ties to the Russian government and whether there might be some collusion between that government and the president’s winning campaign in 2016.

He is rattling some sabers, threatening to fire special counsel Robert Mueller if he looks into the Trump family’s financial dealings.

Here’s where the lesson might kick in.

The special counsel has wide latitude to take the examination wherever it leads. Does the president recall what occurred when an earlier special prosecutor, Kenneth Starr, began examining a real estate matter involving President and Mrs. Clinton? He sniffed around and then learned about a young White House intern. Starr then learned about a relationship she was having with the president. He decided to ask the president some questions about it. He summoned him to a federal grand jury; the president violated the oath he took to tell the truth; he then was impeached.

That’s what happens, Mr. President. Special counsels are within their legal authority to look where they can find to determine the truth. Indeed, an examination of family business dealings well might help the public learn the whole truth about the relationship between the Trump empire and the Russian government. If it finds nothing there, then Mueller’s office can clear the president.

Technically, the president cannot summarily fire the special counsel. He has to ask the Justice Department to do it. Indeed, a leading congressional Republican, Rep. Mike McCaul of Texas, has warned the president about getting rid of Mueller. If he does it, the president faces a bipartisan backlash on Capitol Hill.

Let the process continue, Mr. President. You don’t seem to know the trouble you would purchase if you act foolishly.