Robert Klein Shouts Down Trump Supporters With Falsehoods!

Robert Klein ain't cracking jokes when it comes to Donald Trump -- he came unhinged, ranting about the President's numerous scandals ... then came face-to-face with some vocal Trump supporters.

The scene was unreal Thursday night outside Craig's in WeHo -- the legendary comedian went OFF when we asked about Trump's meeting with Kanye West. He quickly pivoted the convo away from Ye and launched into a tirade about Paul Manafort, Russia and Stormy Daniels ... the whole nine.

Perfect timing for a couple of Trump fans to approach! Warning: Robert's super salty here and drops so many f-bombs, DMX might blush.

He's making zero effort to hide it ... Robert's definitely longing for the days of Barack Obama.