President Donald Trump attacked the head of the largest federation of unions in America on Monday, a day after AFL-CIO President Richard Trumka criticized the president’s trade policies as harmful to U.S. workers.

Trumka, who is president of the American Federation of Labor and Congress of Industrial Organizations (AFL-CIO), was a guest on Fox News Sunday, where he criticized efforts to overhaul the North American Free Trade Agreement. On Saturday, Trump had said there was “no political necessity” to keep Canada as a member of the agreement.

The union head said the U.S., Canadian and Mexican economies are integrated, and he said it would be “hard to see how that would work without having Canada in the deal.”

Trumka also said, “The things that he’s (Trump) done to hurt workers outpace what he’s done to help workers.”

He also cited as harmful to American workers changes to the tax code that encourage companies to outsource jobs, the lack of an infrastructure plan and the administration’s efforts to overturn regulations, including some that protect the health and safety of workers.

Trump started the morning tweeting, “The Worker in America is doing better than ever before. Celebrate Labor Day!’’ before his attack on Trumka.

John Weber, Trumka’s spokesperson, declined to comment about Trump’s tweets, according to a report by Reuters. (VOA)