Washington DC - Three Vietnam War veterans are suing President Donald Trump and his administration over their plans to build a massive arch near Arlington National Cemetery in the nation's capital.

According to Politico, the progressive watchdog group Public Citizen filed a lawsuit in the US District Court for DC on behalf of veterans Michael Lemmon, Shaun Byrnes, and Jon Gundersen on Thursday.

The group argued that Trump has not gotten the required approval from Congress or independent government agencies to build his planned 250-foot "Independence Arch," and asked a judge to prohibit construction.

The suit said of the veterans that the project "would dishonor their military and foreign service and the legacy of their comrades and other veterans buried at Arlington National Cemetery, and would degrade their personal experience when visiting Arlington Cemetery or traveling around Memorial Circle and on the Memorial Avenue Corridor."

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In a statement, a White House spokesperson ensured the arch would be "one of the most iconic landmarks not only in Washington DC, but throughout the world," and that it would "enhance the visitor experience" for veterans and others.

The arch will be the latest in a series of architectural projects with which Trump aims to leave his mark on Washington.

On Thursday, members of the US Commission of Fine Arts, which Trump hand-picked, voted to approve the president's proposal to build a massive ballroom where the East Wing once stood that will be bigger than the White House.