Per Wiki
In the United States, the federal government regulates advertising through the Federal Trade Commission (FTC) with truth-in-advertising laws, and additionally enables private litigation through various statutes, most significantly the Lanham Act (trademark and unfair competition).
The goal is prevention rather than punishment, reflecting the purpose of civil law in setting things right rather than that of criminal law. The typical sanction is to order the advertiser to stop its illegal acts, or to include disclosure of additional information that serves to avoid the chance of deception. Corrective advertising may be mandated, but there are no fines or prison time except for the infrequent instances when an advertiser refuses to stop despite being ordered to do so.
False advertising is the use of false, misleading, or unproven information to advertise products to consumers. The advertising frequently does not disclose its source.
One form of false advertising is to claim that a product has a health benefit or contains vitamins or minerals that it in fact does not. Many governments use regulations to control false advertising. A false advertisement can further be classified as deceptive if the advertiser deliberately misleads the consumer, as opposed to making an honest mistake.
Omitting information
An ad may omit or skim over important information. The ad’s claims may be technically true, but the ad does not include information that a reasonable person would consider relevant. For example, TV advertisements for prescription drugs may technically fulfill a regulatory requirement by displaying side-effects in a small font at the end of the ad, or have a “speed-talker” list them. This practice was prevalent in the United States in the recent past.
Trump could demand that CNN post a permanent disclaimer on all its programming: “WARNING: The contents of this program do not represent an unbiased reporting of facts, but are colored by the prejudices of its originators, and advance an agenda which may or may not be explicitly declared.”