Trump has proven himself to be a true barbarian by proposing to eliminate the modest federal funding for the National Endowments for the Arts and the Humanities and the Corporation for Public Broadcasting.

Why should there be a partisan divide over the funding of public programming for the arts, history, drama, museums, and public media? Don’t Republicans visit museums and listen to history programs on radio and television? Do they enjoy music and dance? Don’t they appreciate art as much as Democrats?

A deep fear came to pass for many artists, museums, and cultural organizations nationwide early Thursday morning when President Trump, in his first federal budget plan, proposed eliminating the National Endowment for the Arts and the National Endowment for the Humanities.

President Trump also proposed scrapping the Corporation for Public Broadcasting, a key revenue source for PBS and National Public Radio stations, as well as the Woodrow Wilson International Center for Scholars.

It was the first time a president has called for ending the endowments. They were created in 1965 when President Lyndon B. Johnson signed legislation declaring that any “advanced civilization” must fully value the arts, the humanities, and cultural activity.

While the combined annual budgets of both endowments — about $300 million — are a tiny fraction of the $1.1 trillion of total annual discretionary spending, grants from these agencies have been deeply valued financial lifelines and highly coveted honors for artists, musicians, writers and scholars for decades.

Nothing will change for the endowments or other agencies immediately. Congress writes the federal budget, not the president, and White House budget plans are largely political documents that telegraph a president’s priorities.

Yet never before have Republicans, who have proposed eliminating the endowments in the past, controlled both Congress and the White House and were so well-positioned to close the agencies. Reagan administration officials wanted to slash the endowments at one point, for instance, but they faced a Democratic majority in Congress (as well as Reagan friends from Hollywood who favored the endowments).

As for 2017, it is unclear whether Republicans who are friendly to the endowments will fight their own party’s president on their behalf. Mr. Trump went ahead with the proposal even though his daughter Ivanka is a longtime supporter of the arts, and Karen Pence, the wife of Vice President Mike Pence, has been a staunch advocate for art therapy for years, being a painter herself.