Interesting that they feel the need for some PR for POTUS in making the announcement!
The No Sail Order reinforces the strong action by President Donald J. Trump and the White House Coronavirus Task Force to combat the spread of COVID-19 in the United States. President Trump acted early and decisively to implement travel restrictions on foreign nationals who had recently been to China and Europe and by issuing the 30 Days to Slow the Spread guidelines. These containment and mitigation strategies have been a critical component of the United States COVID-19 response, but despite these efforts, cruise ship travel markedly increases the risk and impact of the COVID-19 outbreak within the United States.
Just a pity that the research now shows that NY State was being infected via Europe in February. Then the testing debacle, and only last week belated internal flight restrictions. Contact tracing virtually does not exist. Mixed messaging galore. Early and decisive action is not what has been occurring in the USA.