For the sake of argument, let's say you actually put forward a cogent argument with incontrovertible evidence to support said argument. Let's say Trump is a serial liar.
Would you say the same about Joe Biden?
I'll just give you a small sample size of Biden's dishonesty:
-In law school he plagiarized by using 5...count them...5 PAGES of a law review article in a legal brief he wrote.
-He said he was a coal miner from a family of miners-dude never worked an honest day in his life and his family doesn't appear to ever have seen the inside of a mine.
-He said he was in a helicopter that was forced to make an emergency landing near Osama bin Laden's hideout in Afghanistan. Never happened.
-He said the driver of the truck that killed his wife was drunk. He said this repeatedly for political sympathy during campaigns even after the family of the driver asked him to stop. Police report never mentions trucker was under influence, but that his wife crossed the double yellow.
-Claimed his son died in Iraq, he died from a brain tumor in the States 6 years after he returned from Iraq.
-he claimed he, family, and pets almost died in a house fire. Fire department said it was a small kitchen fire easily extinguished, no life was threatened
Those are just a blip of examples from top of my fertile head.
The difference between Trump and Biden is Trump's perceived lies are more exaggerations and braggadocios, ie the best ever, no one's ever seen anything like it; whereas, Biden's are blatantly deceitful.