Days after Senate Republicans proposed pumping $1 billion in public funds into President Donald Trump ’s massive White House ballroom project , the president is sticking by his story that it will be a relative steal — and paid for with just $400 million from donors . Writing on Truth Social, the president said the gigantic structure is “going up rapidly” on the site where the historic White House East Wing stood until he unilaterally ordered it demolished six months ago. He then claimed that the cost for the ballroom, which the White House had initially pegged at $200 million, had gone up to $400 million “after deep rooted studies” and decisions to double the size of the project and build it at “a far higher quality than the original proposal, which would not have been adequate to handle the necessary events, meetings, and even future Inaugurations.” “The original price was 200 Million Dollars, the double sized, highest quality completed project will be something less than 400 Million Dollars.…