what does the rule of law mean?

Over in the failed state of the USA people are rightly accusing Trump of abusing the rule of law.

The main ingredient of the rule of law is due process. Due process is usually a trial. Proving a person is a criminal is as easy as proving voting fraud. It seems Trump can do neither.

Please note there were two problems in the jetting off of those 'illegal' immigrants. The first is whether the act they were sent was legal. The other was the utter failure for Trump to show evidence of the assertions he made which is necessary to deport them. There are problems.

Thus in any democracy a government must adhere to due process. A government that doesn't is veering to autocracy. It gets worse when people are denied entry to a country when officials demand to look at people's phones and deny entry if there is anything critical of trump!