Around a dozen House Republicans are uneasy about the prospect of voting for their party’s budget proposal over potential cuts to Medicaid, according to several people familiar with the conversations.

For Representative David Valadao of California and other Republicans whose constituents depend on Medicaid, a vote for their party’s budget could be politically fatal. President Trump’s agenda hangs in the balance.

GOP lawmakers expected to vote soon on slashing the insurance program for low-income people represent tens of millions reliant on it.