'Challenge me at the convention': Biden throws down gauntlet to critical Democrats
!['Challenge me at the convention': Biden throws down gauntlet to critical Democrats](https://s.france24.com/media/display/aaa4a4a8-3ad3-11ef-972f-005056bf30b7/w:1024/p:16x9/000_362T2QW.jpg)
US President Joe Biden, frustrated by Democrats calling for him to quit, threw down the gauntlet to critics on Monday and called for an end to the intra-party drama that has torn apart Democrats since his dismal debate performance against Republican rival Donald Trump.