Reporters in principle have the ability to get behind the assertions of politicians to tell readers whether they are true or not. Unlike most news readers, they are supposed to have the time and necessary expertise to assess claims being made.
This is why it is striking that Politico reported on the strategy of Trump and Republicans to present their tax cut plan as a populist measure for the middle class as though they were reviewing a play at the theater. While the specifics of the Trump/Republican plan are not yet known, the outline is. It will feature large tax cuts for the rich and trivial tax cuts for everyone else. If the cost of the tax cuts is offset by spending cuts, the typical middle-class family is virtually certain to end up a big loser.
In other words, presenting the tax cut as a populist measure aimed at helping the middle class at the expense of the rich is a lie. Politico's reporters presumably know it is a lie, but decided not to share this information with readers. Apparently, they want to assist Trump and the Republicans in their efforts to deceive the public so that the rich can be made even richer with this tax cut.