Despite Trump taking to Twitter Monday morning to question, "why are we protecting the shipping lanes for other countries (many years) for zero compensation," and asserting further that "All of these countries should be protecting their own ships" — the US naval build-up in the Persian Gulf region continues. 

The US Navy confirmed early Monday that more military ships have arrived in the US 5th Fleet area of responsibility, which includes the Persian Gulf and Middle East waters. Though not pinpointing their exact location, the additional deployment which comes in the wake of last week's US drone shoot down by Iran, that saw Washington coming very close to launching major strikes in response, is described in Navy statements as including a major amphibious assault ship and two support vessels: 

Monday's Navy statement says the USS Boxer amphibious assault ship, along with the amphibious transport dock USS John P. Murtha and the amphibious dock landing ship USS Harpers Ferry arrived in the 5th Fleet's area of responsibility.

USS Boxer Amphibious Assault Ship. Image source: US Navy

The AP notes that the the USS Boxer carries the 11th Marine Expeditionary Unit and a combat helicopter squadron, and departed the US west coast at the start of May as part of a regularly scheduled deployment; however, it's quick transition to the 5th Fleet area is in support of the USS Abraham Lincoln carrier strike group already there in response to Iran. 

The new military arrivals to the region came just as US Secretary of State Mike Pompeo met with Saudi King Salman and separately with Crown Prince Mohammed bin Salman in the port city of Jeddah to tackle the escalating crisis with Iran in the Persian Gulf.