One of Donald Trump’s signature campaign-trail promises was that he was going to build the biggest, most beautiful wall along our southern border to keep out Mexico’s “bad hombres.” Another thing he promised was that Mexico was going to pay for said wall, which is generally considered a rude ask of your neighbor. Unsurprisingly, Mexico has said repeatedly it will not fund the wall, which has led Trump to announce his considerably less Art of the Deal–sounding Plan B: that the U.S. will pay for the wall, and maybe Mexico will reimburse us the $21 billion later. Sadly for Trump, though, even his Plan B has hit a bit of a roadblock, namely that Congress isn’t necessarily keen on paying for his little passion project, either. Per Politico:

Trump hoped to jump-start construction of a massive wall on the U.S.-Mexico border with money in a must-pass government funding bill. But Democratic leaders are vowing to block any legislation that includes a single penny for the wall. With the GOP consumed by its own divisions, the White House and Hill Republicans will have to rely on Democratic votes to avoid a government shutdown next month in what would be another disaster for Trump’s fledgling presidency.

Republican leaders, wary of this, are considering a plan that would not directly tie the border wall money to the April 28 government funding deadline. Some Republican insiders worry that the president cannot afford another major legislative setback—and they believe a shutdown showdown would result in just that. While no decision has been made by GOP leadership, Republican lawmakers may decide to decouple the two to avoid a confrontation with Democrats. If they do, the chances of getting Trump’s wall funding passed this spring become slim.

As Politico notes, the notion of the U.S. paying for the wall is not very popular and it fails to unify congressional Republicans quite like getting rid of evil Obamacare or confirming second-coming-of-Scalia Supreme Court nominee Neil Gorsuch, which therefore “makes it a harder sell to the rank-and-file GOP—especially if pressing it means playing a government shutdown blame game with Democrats.”

While one senior Republican suggested that Trump “dare the Democrats to shut down the government over this,” another, perhaps slightly more mature Republican told Politico, “The Trump administration can't have another disaster on its hands. I think right now they have to show some level of competence and that they can govern.” The end result may be no wall, at least not for a while.