POTUS  has the authority to deem whatever is necessary to insure the safety of the American people. This includes vetting non-citizens of the US.  Other countries would do the same.

The Trump administration rushed to judgment  and didn't use the prose while vetting those of non-citizen/visa origin. The initial result at the airport held certain individuals for awhile, then were released after proper vetting. They were not detained or sent back to their country of origin unless suspected of being a security threat.

Watson & the Left-wing media are utilizing clips from POTUS campaign to justify their argument in Trumps excluding 'muslims' and certain ethnic groups. Not rule of law.

What would Inspector Clouseau say about Watson ?