Just because the current president is the poster boy for lying does not mean that this art is not practiced by other (make that "all" poiticians)--To quote from Harold Pinter's outstanding Nobel lecture, "Art, Truth & Politics":
"Political language, as used by politicians, does not venture into any of this territory since the majority of politicians, on the evidence available to us, are interested not in truth but in power and in the maintenance of that power. To maintain that power it is essential that people remain in ignorance, that they live in ignorance of the truth, even the truth of their own lives. What surrounds us therefore is a vast tapestry of lies, upon which we feed....It's a scintillating stratagem. Language is actually employed to keep thought at bay. The words 'the American people' provide a truly voluptuous cushion of reassurance. You don't need to think. Just lie back on the cushion. The cushion may be suffocating your intelligence and your critical faculties but it's very comfortable. This does not apply of course to the 40 million people living below the poverty line and the 2 million men and women imprisoned in the vast gulag of prisons, which extends across the US."
Pinter was being awarded the Nobel Prize for literature. The entire lecture is worth a listen and can be found here:
For those who enjoy yet another reason to despise Donald Trump, it might be worth contemplation to consider that Trump in all his dysfunctional absurdity is a mirror reflecting the American people whose government he, (along with the majority of both houses of congress). leads.