They make it up. "Trump asked Russia to hack US servers," "Trump won't stop talking about Khan," and even "Trump insulted Khan" are all lies - the press knows those accusations are false, and runs with them anyway.
It takes very little creativity to take a fact, and spin it into a false. On top of that, this craft of lie-weaving is one the press is experienced at, so by now it comes naturally.
They can't bloody well report the truth, because the truth cuts against their self-interest and intended outcome.
Yep, synthetic, GMO “news”....