Donald J. Trump presumably counted on unanimous support from Texas’s Republican congressional delegation to build The Wall separating the state from Mexico.

He didn’t get it. Imagine that, will ya?

GOP Sen. John Cornyn, the state’s senior U.S. senator, hedged significantly on whether he wants to spend $5.7 billion to build The Wall along our southern border. He met with the president today in McAllen, along with Lt. Gov. Dan Patrick and Sen. Ted Cruz.

Patrick wants The Wall erected so badly that he reportedly — according to Trump — offered to have the state pay for its construction.

Cornyn, though, says the state’s 1,200-mile border with Mexico is quite geographically diverse. He is not sure about how much he wants to spend, but it appears that he isn’t on board with the $5.7 billion the president wants.

Consider, too, that the entire length of the Texas-Mexico border runs along the Rio Grande River, which presents an entirely different set of circumstances confronting other border states. New Mexico, Arizona and California are bordered along land with Mexico; the Texas border meanders a bit, much of it through some very rough, and scenic territory. We also have that big ol’ national park at Big Bend with which to deal.

Oh, and then we have that thing called “eminent domain,” given that almost all the land along our border is held privately. The government cannot seize that land without offering “just compensation,” as it is spelled out in the Fifth Amendment to the U.S. Constitution. It’s going to get really expensive to build it.

So, how much support does The Wall have? Politico talked to 17 House members and senators who represent states and House districts along the border. Just two of them — Cruz and fellow Republican Sen. Martha McSally of Arizona — said they support The Wall.

Trump boasts about GOP solidarity. Yep, the party sounds pretty solid, all right, but not in the way the president keeps saying.