What's the most worrisome foreign intrusion into the United States — unauthorized immigrants, Chinese imports or interference in our democracy?
For Donald Trump, it's immigrants and imports. He doesn't care much about the third.
"Border security is national security," Mr. Trump said last week, as he threatened a government shutdown if Congress didn't come up with money to build a wall along the Mexican border (at an estimated cost of at least $25 billion).
Meanwhile, Mr. Trump has ordered his administration to consider raising tariff rates on $200 billion of Chinese goods, prompting China to threaten higher tariffs on $60 billion more of American...