The German Foreign Ministry has revised its travel advisory for the United States, emphasizing that visa waivers or travel authorizations do not guarantee entry for its citizens.

This decision comes in response to recent incidents involving the detention of multiple Germans at U.S. borders.

The updated guidance was published on the ministry's website on Tuesday, highlighting that approval through the U.S. Electronic System for Travel Authorization (ESTA) or a U.S. visa does not assure admissibility in all circumstances.

A spokesperson for the ministry stated on Wednesday, "The final decision on whether a person can enter the United States rests solely with U.S. border authorities."

The spokesperson clarified that the advisory update does not constitute a travel warning.

Since the inauguration of President Donald Trump on January 20, a series of executive orders pertaining to immigration have been enacted, focusing on stricter border policies and visa scrutiny, along with a rigorous crackdown on undocumented immigrants residing in the U.S.

Earlier this week, the German Foreign Ministry indicated that it is monitoring potential changes to U.S. immigration policy following the detention of three citizens.

Two of these cases have been resolved, with the affected individuals returning to Germany, while the remaining situation is being managed with assistance from the German Consulate General in Boston.

Reports from local media indicate that U.S. immigration authorities apprehended a German national holding a permanent resident permit in the U.S. at Boston Logan International Airport this month, where he is currently being held at a detention center.

As of now, the German Foreign Ministry has not provided further information regarding the specifics of the detainee's situation.