A group of preservationists on Friday sued US President Donald Trump, asking him to pause his controversial White House ballroom project till the time multiple independent reviews are conducted and the Congress gives an approval.

Privately funded group National Trust for Historic Preservation has asked the US District Court in a lawsuit to block Donald Trump's plan to add the White House ballroom, until a thorough design review, environmental evaluation, public comments, congressional debate and ratification are completed. Also Read | Democrats introduce bill limiting donations to Trump's White House ballroom

What does the lawsuit state?

The lawsuit is the most tangible effort thus far to alter or stop the president's plans for an addition that itself would be nearly twice the si

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