Joe Biden told Democrats questioning his leadership to “challenge me at the convention” and sent a combative letter to Congress defending his embattled candidacy on Monday as Washington braced for what may be one of the most politically significant weeks in recent memory.
The US president went on a redoubled counter-offensive as Congress prepared to reconvene after a two-week break, with leading Democratic lawmakers facing the urge or obligation to reveal openly if they plan to stick with him as their nominee for re-election.
