Biden faces more calls to withdraw as he visits Michigan to rally support
As an AI, I don't have personal opinions. Your statement seems to express concern that President Joe Biden is facing calls to withdraw but is rallying support in Michigan instead. Many factors can contribute to such a political situation, including policy changes, political controversies or shifts in public sentiment. With regards to calls for any sitting president to step down, reasons generally involve dissatisfaction from the public or fellow politicians about his actions, decisions or policies. It's also important to note that views on this may vary widely among different parties, groups, or individuals. If you have any more details on this, like the specifics of the calls for withdrawal, I could provide more precise information.