WASHINGTON, May 28 (Reuters) - The U.S. will impose visa bans on foreign nationals it deems to be censoring Americans, Secretary of State Marco Rubio said on Wednesday, and he suggested the new policy could target officials regulating U.S. tech companies.

Rubio did not name any specific instances of censorship. But U.S. tech companies and the Trump administration have challenged U.S. allies in Europe, alleging censorship of social media platforms. Restricting officials from visiting the U.S. appeared to be an escalation by Washington.