From the article:

"But Judge Black harbors no illusions about the authorities actually bringing in the president for questioning as a result of his warrant. He also doesn’t pretend that his warrants have much legal force beyond the lines of the Davy Crockett National Forest and the rest of rural Houston County, which lies about 100 miles north of its namesake city.

“It’s a serious warrant to have these people brought before me,” he said of Mr. Biden and Dr. Fauci. “Realistically, however, I doubt the Secret Service will give them up. My authority doesn’t extend beyond state lines. But should they come into Texas, well …”