Several influential congressional Democrats said privately on Sunday they want Joe Biden to step aside as the party’s White House nominee, as the president enters a pivotal week for his teetering reelection campaign.The latest defections include several Democratic leaders of House committees, a signal that even some party stalwarts in Congress want a new person at the top of the ticket following Biden’s stumbling debate against Donald Trump last month.The defections include Jerry Nadler and Joe Morelle of New York; Adam Smith of Washington; and Mark Takano of California, according to people familiar with the discussion. The members expressed their views in a private virtual call on Sunday afternoon organized by House Minority Leader Hakeem Jeffries. That amounts to a total of nine House Democrats who have called for Biden to step aside.