And, apparently there is no need to change a single law.
Here is the story from the Epoch Times (hat tip: Judy):
Trump Administration Signals Tougher Action to Bar Communist Party Members From Immigrating to US
The U.S. Citizenship and Immigration Services (USCIS) on Friday published a policy alert about banning members of the communist party or any other totalitarian party from getting an immigrant visa.
“In general, unless otherwise exempt, any intending immigrant who is a member or affiliate of the Communist Party or any other totalitarian party (or subdivision or affiliate), domestic or foreign, is inadmissible to the United States,” USCIS said in a policy alert (pdf).
People with membership or affiliation with the communist party or other totalitarian parties are inconsistent and incompatible with the Naturalization Oath of Allegiance to the United States of America, which includes pledging to “support and defend the Constitution and laws of the United States,” the agency said in a statement.
The policy alert didn’t announce any new immigration policy but suggests the Trump administration may take tougher action to enforce related policies.
USCIS explained in its Policy Manual that the policy is based on a series of laws passed by Congress between World War I and the 1950s. Those laws state that any alien who is or has been a member or affiliate of a Communist or any other totalitarian party are “inadmissible” for immigration into the United States.
[….]
As the biggest communist party in the world, the Chinese Communist Party (CCP) members are expected to be affected most by the new policy.
Of course there are exceptions and people trying to get into the US will lie, but even taking this position signals where this administration is on the spread of communism.