Story highlights Sanders ran a failed bid for the Democratic nomination in the 2016 election

He's not thinking about the 2020 election yet

Washington (CNN) Vermont Sen. Bernie Sanders sat down with CNN's Chris Cuomo for a town hall Monday night to have a "serious discussion about the issues impacting the American people," he said.

Sanders, who ran a failed bid for the 2016 Democratic presidential nomination against Hillary Clinton, is a progressive leader whose views will help shape the future of the Democratic Party in the wake of Donald Trump's election.

Here's a look at the night's most memorable lines:

On Trump's honesty

"We are dealing with a man who, in many respects is ... a pathological liar," said Sanders. "Time after time after time he says stuff that is blatantly, absolutely untrue."

Bernie Sanders on Donald Trump: We are dealing with a man who is "a pathological liar" #SandersTownHall https://t.co/Jjpmx3wgXj — CNN Politics (@CNNPolitics) January 10, 2017