Biden's approach to debt ceiling negotiations draws criticism and urgency from Senate Democrats.

Some Senate Democrats are circulating a letter urging President Joe Biden to prepare to invoke the 14th Amendment to lift the debt ceiling and avert default on his own, without an act of Congress. The letter is being led by Sen. Tina Smith, D-Minn., as well as Sens. Elizabeth Warren, D-Mass., Jeff Merkley, D-Ore., Ed Markey, D-Mass., and Bernie Sanders, I-Vt. The emerging letter is a sign of growing progressive dissatisfaction with some aspects of the legislative negotiations, like Republican demands to impose tougher work requirements to receive federal benefits.