House Republicans are working to hold defections on legislation to block President Donald Trump’s emergency declaration to potentially under a dozen on Tuesday.

The White House and GOP leaders have launched a last-minute push to limit the losses on a House vote to stop Trump from circumventing Congress to build a border wall, in a bid to avoid a humiliating defeat for the president, according to multiple Republican sources.

So far, just one Republican — libertarian Rep. Justin Amash (R-Mich.) — has backed a Democratic measure to overturn Trump’s national emergency declaration.

There’s little doubt that the resolution will easily pass the House. Instead, the question is whether at least four GOP senators will create a bipartisan majority and help deliver the biggest rebuke of the president since Democrats regained the House last fall.