President Trump’s proposed military parade would cost the federal government between $10 million and $30 million, budget director Mick Mulvaney estimated Thursday.

Mulvaney, who leads the Office of Management and Budget, was asked by Rep. Barbara Lee, D-Calif., during a hearing on the president’s proposed 2019 budget about a possible price tag of a military parade, an idea that the president is mulling.

“It’s between 10 [million] and 30 [million], depending upon the length,” Mulvaney said. “Obviously an hour parade is different than a five-hour parade in terms of cost and equipment and those types of things.”

Mulvaney said the money was not included in Trump’s budget request for 2019 because the president started discussing a military parade with defense officials just last month. The budget director said Congress would either have to appropriate money for the event if it were to move forward, or the Trump administration would need to find funds.

“We’ve not done much research on it yet,” Mulvaney said.

Trump raised the possibility of a military parade to highlight the strength of the military and appreciation for the troops during a meeting at the Pentagon last month. The idea stemmed from the Bastille Day celebration Trump and first lady Melania Trump attended with French President Emmanuel Macron last year.

The president is reportedly interested in a military parade taking place down Pennsylvania Avenue and potentially occurring on Veterans Day, which this year coincides with the 100-year anniversary of the end of World War I.

Secretary of Defense Jim Mattis told reporters last week the Pentagon is “putting together some options” for a military parade to send to the White House for a final decision, but noted planning for an event is in the early stages.