Republican lawmakers are expressing dissatisfaction with the recent debt ceiling deal between US President Joe Biden and House Speaker Kevin McCarthy. Despite relying on the support of Democratic lawmakers to pass the bill in Congress, some Republicans have called the deal "completely unacceptable" and "insanity," citing a lack of substantial spending reductions. McCarthy is confident that the bill will pass, but may have to rely on support from Democrats to prevent a potential default. The last bill to increase the debt ceiling passed with a narrow margin, and Republicans may have to crack the whip against colleagues to ensure its passage.