In late July, the US commented that the UK's proposed plan to launch an EU-led maritime security initiative in the Strait of Hormuz is a 'complement' in the existing US presence in the area, as until now it has been a stand-alone operation for the States.
Reuters informs that this issue was firstly published by Germany's DPA news agency, and were later on confirmed by an Embassy spokesman, commenting
We’ve formally asked Germany to join France and the UK to help secure the Straits of Hormuz and combat Iranian aggression. Members of the German government have been clear that freedom of navigation should be protected… Our question is, protected by whom.
In general, the tensions between Iran and the US began in 2018, when Washington withdrew from the nuclear deal with Iran and reimposed sanctions on Tehran.
In light of US's invitation in participating, Nils Schmid, a foreign affairs spokesman for the SPD parliamentary party added that the German government has already rejected the invitation in taking part in the US military operation.
It should stay like that. Otherwise, there is a risk of being pulled into a war against Iran on the side of the United States.
... Mr Schmid concluded.