President Trump has plunged once more into the nation’s cultural wars — this time with Washington’s famous Smithsonian Institution in his sights. As is often the case, the manner of Trump’s attack risks significant blowback,

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

President Trump confirmed the White House is doing a review Smithsonian museums, where he complained "everything discussed is how horrible our Country is."

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.

Through its 21 museums, 21 libraries, 14 education and research centers and a zoo, the Smithsonian Institution’s collections are expansive and cover every aspect of U.S. history, including more than 200 years of slavery.

In April, the National Museum of African American History and Culture sparked controversy after it announced it would return several artifacts to their donors, including a Bible carried during a civil rights protest and Harriet Tubman’s book of hymns, NBC News reported.

The White House is calling for a review of materials in the Smithsonian museums ahead of America’s 250th birthday next year.

Trump slams Smithsonian for focusing on slavery, sparks outrage over claims it ignores American success and "exceptionalism."