The White House issued a presidential proclamation early Tuesday by Trump ordering the lowering of the flags over the Annapolis attack - four days after Maryland Gov. Larry Hogan, a Republican, issued an order for flags flown at state institutions.
Jarrod Ramos, 38, allegedly killed five inside the Capital Gazette newsroom in Annapolis, Maryland last week.
USA president Donald Trump, who has had a combative relationship with the media since his 2016 election, was asked by reporters traveling with him on Air Force One whether he was reconsidering calling journalists "enemies of the people".
The proclamation ordered the flag at the White House and all other federal buildings and grounds to be flown at half-staff until sunset Tuesday.
Hundreds of people gathered on Friday evening to remember the five people gunned down at a community newspaper office in Annapolis, Maryland, one of the deadliest attacks on journalists in United States history.
"This is a missed opportunity to make a truce with the press", Rottinghaus said of the president.
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Sgt. Jacklyn Davis, a spokeswoman for Anne Arundel County police, said the letters were received Monday. But Buckley said had hoped Trump would do the right thing and lower the American flags as well.
ANNAPOLIS, Md. - The man accused of killing five Capital Gazette staff members had threatened the newspaper in 2013 and continued to pepper social media with dark and often profane warnings.
On Monday night, an overflow crowd gathered to remember Rob Hiaasen, Gerald Fischman, John McNamara, Rebecca Smith and Wendi Winters with stories, poems, prayers and songs.
Though Trump publicly called the Capital Gazette shooting a "horrible, frightful event" and expressed support for the victims, in private he has told associates that he believes that what he called "the fake news" would blame him and his fiercely anti-press rhetoric for sparking the shooting, according to a report by The Daily Beast.
Ramos signed the letter under the statement: "I told you so", and then wrote that he was on the way to the newspaper "with the objective of killing every person present".
Maryland's Governor had ordered state flags to be lowered to half-mast, but last week Mr Buckley told the Baltimore Sun he thought The Capital Gazette shooting merited national recognition as well.
Buckley, elected Annapolis mayor previous year, submitted the flag request to the White House over the weekend and said he was disappointed it was not initially approved.