The already-divided Republican Party won’t survive if party leaders continue to betray their voters on immigration, Fox News host and Daily Caller co-founder Tucker Carlson warned Thursday night.

President Trump is throwing away his only good bargaining chip by caving to Democratic demands on the Obama-era Deferred Action for Childhood Arrivals (DACA) amnesty program without securing anything in return, Carlson said. Trump said Thursday that a border wall — the signature policy of his presidential campaign — will have to wait until after Congress passes amnesty for DACA recipients, a position Trump opposed during the campaign. If Trump doesn’t get funding for the wall now, Carlson said, it will never happen.

“The president seems confident it will work out in the end, but there’s no reason to be optimistic. The fate of DACA recipients is, by far, the biggest piece of leverage he ever will have. If he gives it away for free, none of his other immigration priorities, the priorities he ran on and won the presidency with, will even be considered. All those ‘border security’ measures you keep hearing about? They’re ridiculous, they mean nothing,” Carlson said. “And in any case, they’ll be rolled back instantly the next time a Democratic president wins. If this president doesn’t get funding for a wall now, it will never be built, period.”

“In Israel and Hungary, a wall has proven effective, and that is why Democrats oppose one on our border – not because it won’t work, but precisely because it will work. The Democratic Party has no interest in halting the flow of illegal immigrants, no matter how much it might hurt Americans who already live here. They’ve done the math. Democrats lost in 2016 because our middle class rejected them. That means they’ve got two options now. They can embrace the issues the middle class cares about or they can import an entirely new electorate from the third world and change the demographics of the U.S. so completely, they will never lose again. They are going with the latter option,” Carlson said, predicting that allowing illegals to vote will be a mainstream Democratic position within five years.

Carlson also hammered Republican leadership for not keeping their promises to their voters.

“Earlier this year, we spoke to [Speaker of the House Paul Ryan] on this show and he assured us the House would be working hard to fund the border wall. That was a lie, and not the only one the GOP leadership has told its voters,” he said.

“Nominally, Congress is controlled by Republicans, but on immigration, Democrats control the agenda. Why is that? Because Paul Ryan and many other corporate Republicans agree with them on every substantial point related to immigration. President Trump goes along with this because he wants a legislative victory badly and his party is incapable of giving him one. This arrangement cannot last forever. A party this out of sync with its own voters will collapse and splinter.”

Carlson noted that there is room for compromise on DACA in addition to securing funding for the border wall, and said that Republicans should implement a ban on chain migration via family reunification policies and require DACA recipients to give up their citizenship in all other countries.

Of course there should be room for disagreement on immigration within the Republican Party, Carlson said, “but there ought to be some nonnegotiable principles at the center of it all: Borders are real. Citizenship matters. America comes first. If you can’t say any of that with a straight face and mean it and act on it, maybe you are in the wrong party.”

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