President Donald Trump’s pet project is hanging by a thread.

The political risk of spending taxpayer dollars on parts of a new White House ballroom has unsettled congressional Republicans, who are questioning whether they can approve $1 billion in Secret Service security funding — even as officials from the agency, the Department of Homeland Security and the White House blanket Capitol Hill to make the case for its necessity amid growing threats.

Senate Republicans, including party leaders, are discussing making potential changes to the billion-dollar item as they deal with member concerns and wait for the chamber’s parliamentarian to rule on…

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