U.S. President Donald Trump suggested on Tuesday he will pressure the Smithsonian Institution - a premier museum, education and research complex for U.S. history and culture - to accept his demands, just like he did with colleges and universities by threatening to cut federal funding.

Lindsey Halligan, the president's special assistant, told Fox News "we can’t just keep focusing on the negative."

President Donald Trump threatened to unleash his attorneys on the Smithsonian, saying the institution was fixated on “how bad slavery was.”