One of the downsides, or at least controversial aspects, of Abraham Lincoln's presidency:
Sunday, Feb. 8 1863
CHICAGO CIRCULATION CRUELLY CURTAILED
Respect for the First Amendment was not considered absolute in these times. There were quite a number of cases in which newspapers, magazines and other periodicals were threatened, harassed, fined, arrested or otherwise aggravated in their pursuit of truth, justice, and their right to editorialize. On this day, circulation of the Chicago Times was suspended by military order. The offense was the publication of disloyal statements. Abraham Lincoln had first authorized the suspension of the right of habeas corpus, despite the fact that the Constitution allows only Congress to do so.
I can't imagine a president today(or in the foreseeable future) attempting anything close to that. Impeachment would be the last of his or her worries.