Last week the State Department announced the intention not to sanction the pipeline's Russian-owned operator, Nord Stream 2 AG and its CEO Matthias Warnig.
US sanctions have repeatedly tried to stop further construction of the gas pipeline.
But the pipeline has been backed by the government of Chancellor Angela Merkel.
The project is a serious obstacle for a new start in transatlantic relations.
Taking into account the different position of Berlin, Washington refused to take tougher measures.
The pipeline has largely been completed.
Around 13.9 km of one line and 16.8 km of the 2nd line are missing in German waters.
Gazprom is racing to finish the $11.5 billion gas pipeline which analysts expect could happen by September 2021.