WASHINGTON—The Trump administration is intensifying U.S. pressure on China, piling on visa bans, sanctions and other constraints that are battering presently unsettled ties involving the world’s two premier economies.

Lawyer Typical William Barr, in a speech Thursday, warned U.S. businesses that they are at threat of collaborating with a Chinese government that eventually seeks to supplant them in its increasing state-run economy. Administration officials are also talking about banning travel by China’s Communist Get together users and…