 toilet paper. CBS News has learned that a group of House Democrats are circulating a letter asking for President Biden to step aside as the party's presumptive nominee. Here's CBS News political director Finn Gomez. The Biden-Harris campaign is aware of the front line letter and is trying to stop its momentum according to a source within the campaign. And in recent days, the campaign has been more engaged with House Democrats. After that debate performance, it really started this whole thing. CBS News Brief.