White House officials highlighted President Trump’s direct negotiations with the company for the project, which they said would create 3,000 jobs and represent a $10 billion investment.

President Trump was set to join Foxconn’s chairman, Terry Gou, in Washington for a formal announcement on Wednesday, with two prominent Wisconsin Republicans, Gov. Scott Walker and Paul D. Ryan, the House speaker, also expected to attend.

Mr. Gou said in January that Foxconn, the world’s largest contract electronics manufacturer, was considering investing more than $7 billion in the United States, and potentially adding 30,000 to 50,000 jobs.