House Republicans are sending a clear and early warning to their Senate allies as the bill encompassing President Trump’s domestic priorities heads to the upper chamber: Don’t water it down.

House GOP leaders spent weeks in delicate talks with Republican holdouts before cobbling together a fragile agreement that could thread the needle between conservatives’ demands for more spending cuts and moderates’ insistence on a controversial tax break.

As the massive package heads to the Senate, the critical voices of the House debate — blue-state Republicans, hardliners and party leaders — are cautioning their upper-chamber counterparts not to alter their design too severely, or it will never get through the House on its return.

The warnings forecast a coming clash between Republicans in the two chambers, since many senators are already saying they can’t support the package without substantial changes.

House conservatives would be fine with some changes — if they shift the bill to the right with more spending cuts and deficit reduction. At the bare minimum, they’re demanding that the Senate keep in place hard-fought provisions to limit Medicaid eligibility and roll back green-energy subsidies adopted by the Biden administration.

"They've got a lot they still need to do to make it better, and they can't unwind what we achieved. And those are going to be red lines," said Rep. Chip Roy (R-Texas). "If the SALT guys think they've got red lines, just wait until you see what's coming out of us."

Blue-state Republicans have their own concerns. They went to the mats to lift the $10,000 cap on the state and local tax (SALT) deduction, and they don’t want Senate Republicans to nibble away at their hard-earned victory.

Their agreement included not only an increase in the cap — to $40,000 for those making up to $500,000 — but also commitments on how to handle the threat of any Senate changes.

Unlike in the House, Senate Republicans do not represent regions where constituents are........

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