The White House defended reports it planned to spend nearly a $1bn on controversial construction projects.

The Trump administration has responded to controversy over construction and expansion projects at the White House by saying the work was “long-overdue and necessary” and “inextricably tied to the security of the President, the White House grounds and the certain security infrastructure assets”.

US President Donald Trump’s administration has long insisted construction is being funded by private donors and is necessary for security reasons. But on Wednesday, The Washington Post cited documents it obtained that showed the administration was planning to spend nearly $1bn on the construction work, which includes a large new ballroom to replace much of the White House’s East Wing.

White House spokesman Davis Ingle, in a statement to Al Jazeera, cited recent security incidents, including attempted attacks on the president and events around the 250th anniversary of US independence, as reasons for the work.

Ingle said the work was being done in coordination with the Secret Service and White House Military Office. He also said approximately $400m in funding for the new ballroom was coming from “President Trump and generous American patriots”.

About $875m has been put into the White House Repair and Restoration account, which typically has only several million dollars and is used for routine maintenance and upkeep. Some $500m of that money came from the Secret Service and the White House Military Office, tasked with securing the president and his family, as well as top US officials. Another $305m, according to The Post, came from private donations, while the provenance of another $70m was not indicated.

The White House reconstruction project has faced scrutiny from lawmakers, as well as courts, over concerns that vested interests, including private businesses seeking government contracts, are paying for the work in exchange for government favours. A federal judge in Washington, DC, last week ordered a halt to work specifically for the ballroom, saying it needed Congressional approval under existing law. In June, the advocacy group Public Citizen said it found corporate donors to the project had received more than $50bn in government contracts during the previous six months.