WASHINGTON — The Trump administration plans to introduce an updated version of a long-disputed travel ban enacted shortly after President Trump’s inauguration in 2017, expanding the list to include countries the White House has suggested have fallen out of compliance with United States security measures.

Mr. Trump told The Wall Street Journal on Tuesday in Davos, Switzerland, that he planned to expand the current travel ban, although he did not specify which countries would be added.

An extended list — which includes Belarus, Myanmar, Eritrea, Kyrgyzstan, Nigeria, Sudan and Tanzania — was confirmed by a senior administration official, who also stressed that it may change. Different versions of the proposed list have been circulating for weeks.

Another person familiar with discussions about the ban said the new countries would not necessarily be in the same region as those on the 2017 list, which includes Iran, Syria, Yemen, Libya, Somalia, Chad, Venezuela and North Korea. Visitors from Iraq and Sudan were banned under previous versions, but are now allowed.