Treasury Secretary Steve Mnuchin said Sunday he was justified in using a charted military flight for travel to Fort Knox, Ky., during the August solar eclipse.

"I never said it was a mistake," Mnuchin said in responding to NBC's "Meet the Press" host Chuck Todd on Sunday. "It was approved by the White House and there were reasons why we needed to use that plane that were completely justifiable and we look forward to the [inspector general's] report."

Todd's line of questioning follows Friday's resignation by Health and Human Services Secretary Tom Price who became embroiled in a scandal after it was disclosed he spent around $1 million of taxpayer money on private chartered flights.

Mnuchin did not comment on the resignation when asked by Todd.

Mnuchin said the American people deserve to know how their money is being spent and that it is being spent responsibly.

The "only reasons" for using private planes include "national security or if we couldn't get somewhere," he said.