The battleground state is crucial for a win in November, even as an 18th House Democrat asks him to step aside
Joe Biden was headed for the battleground state of Michigan on Friday, to campaign both for re-election and for his survival as the Democratic presidential nominee.
In Washington, calls for the 81-year-old president to quit continued, while the Democratic leader in the House of Representatives said he had discussed the issue with Biden in private on Thursday night, after the US president’s press conference following the Nato summit.