a good example would be Trump' alleged 'suckers and losers' comment regarding fallen soldiers.

This was a rumor started by The Atlantic article citing 'anonymous sources' which spread and re-broadcasted by all news networks and NYT, some of these third-hand versions of the rumor claimed additional verification by, guess what, another group of 'high-ranked anonymous sources', completely ignoring rejection of these allegations by everyone who actually attended that particular event with the President.

This is the definition of slander which is somehow acceptable if you (and your reader base) hate a particular person or ideology.