Biden under renewed pressure to step aside as top Democrats make agonized appeals

Senator Michael Bennet said Trump may win by a landslide' while two more senators echoed his concerns

Joe Biden came under renewed moral pressure on Wednesday to abandon his presidential candidacy amid agonised appeals by a succession of senior Democrats for him to consider the broader picture.

Those calls came as the US president dug in his heels to make it hard to supplant him as the nominee.