I want to give an alternative answer from a local (Virginia) point of view.
Close to Roanoke, Virginia (where Bowers is mayor) are the luxury resorts Homestead and Greenbrier.
Immediately after the bombing of Pearl Harbor, Japanese, Germans, Italians, Hungarians, Bulgarians, and Romanians were held at these luxury hotels. These were foreign nationals (diplomats and their families).
The University of Virginia law library makes many primary references concerning this internment of Japanese foreign nationals available in the collection:
Greenbrieir Hotel Mission
As a summary see Diplomats, Disputes & Deceit World War II's
First Exchange of Enemy Diplomats
Ten days later on December 17, an executive at the Greenbrier Hotel, deep in the Appalachian Mountains, at White Sulphur Springs, ...
Just after lunch the manager received a telephone call from a representative of the Chesapeake and Ohio Railroad (C&O), the owner of the hotel, who inquired if the Greenbrier would be interested in housing the Axis diplomats, their families and the nationals of various enemy countries. Later that evening a second call was taken by the hotel management from the State Department informing staff of an order issued by President Roosevelt that the foreign diplomats of the warring nations were to be removed from the nation's capitol within 48 hours and taken to the Greenbrier. The staff was then advised of the imminent arrival of the uninvited guests and were reminded they were "avowed agents of a hostile governments and to be aware some were undoubtedly the directing heads of fifth column activities in the United States."
The Protocol Division of the State Department advised the hotel when such officials are caught in a country during war, the diplomats are entitled to living conditions according to their customary living standards which, in the United States, would be maintained as far as possible while awaiting their return to their homeland.
The United States Government official in charge of overseeing the detention of the internees at the Greenbrier Hotel and Virginia's Homestead Hotel, the locations for the internment, was Roy L. Morgan, special agent for the FBI. He was to monitor the activities of 1,200 European and Japanese diplomats confined to the two hotels from December 1941 until June 1942, while waiting repatriation to their home countries. During this period Agent Morgan filed many confidential memoranda to J. Edgar Hoover concerning the activities of the detainees. The reports to Hoover contained a wealth of information regarding the Japanese diplomatic mentality and efforts of espionage in the United States.
The mayor's statement "President Franklin D. Roosevelt felt compelled to sequester Japanese foreign nationals after the bombing of Pearl Harbor" is clearly true.
It is also true that Roosevelt later issued executive order 9066
...I hereby authorize and direct the Secretary of War, and the Military Commanders whom he may from time to time designate, whenever he or any designated Commander deems such action necessary or desirable, to prescribe military areas in such places and of such extent as he or the appropriate Military Commander may determine, from which any or all persons may be excluded, and with respect to which, the right of any person to enter, remain in, or leave shall be subject to whatever restrictions the Secretary of War or the appropriate Military Commander may impose in his discretion.
This order was used by General DeWitt to establish a specific west coast zone thousands of miles away from Virginia from which Japanese (including Korean and Taiwanese) ethnicity persons were excluded. This eventually led to internment of both Japanese foreign nationals and US citizens who remained in the military exclusion zone as well addressed by the other answer.