(Bloomberg) -- A group of 43 Senate Republicans including Minority Leader Mitch McConnell said they’d oppose allowing a vote on legislation increasing the US debt limit with no strings attached, saying “substantive spending and budget reforms” must be part of the package.

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Representing almost all Republicans in the chamber, the group’s letter to Majority Leader Chuck Schumer signaled that they’d vote to block legislation, showing that Democrats lack the votes to advance a so-called clean debt limit bill.

The letter adds to GOP efforts to cajole President Joe Biden to agree to some kind of deal on spending cuts as part of efforts to raise the $31.4 trillion borrowing limit and avert a catastrophic US payments default. Biden and top congressional leaders are due to meet Tuesday for highly anticipated talks amid the stalemate.

“It is now clear that Senate Republicans aren’t going to bail out Biden and Schumer, they have to negotiate,” Senator Mike Lee, a Republican from Utah, said in a statement. “I thank my colleagues for joining my effort to emphasize this point in the clearest possible terms.”

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