Washington (CNN) Trump administration officials are discussing adding more countries to the travel ban list, two sources tell CNN, potentially expanding the controversial ban that has been criticized as discriminating against Muslims.

An inter-agency discussion about imposing travel restrictions on countries that are not compliant with electronic documents and information sharing -- a key focus of the administration -- is underway, according to a senior administration official. Fewer than five countries are under consideration, the official said.

The goal, the official said, is to "bring governments into compliance by using the power of access to the United States." The travel restrictions would be tailored to the countries, if they're added, and not impose a ban on them altogether, the official noted.

The administration has argued that the travel ban is vital to national security and ensures countries are in compliance with security measures. But critics say the restrictions imposed by President Donald Trump's executive order are an attempt to ban Muslims from entering the United States. It's unclear which countries are currently under consideration and if they are majority Muslim.

In 2018, the Supreme Court upheld the third version of the travel ban after previous bans ricocheted through the courts. The ban restricts entry from seven countries to varying degrees: Iran, Libya, Somalia, Syria and Yemen, along with Venezuela and North Korea. Chad was removed from the list last April, after the White House said the country improved security measures.

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