President Donald Trump has exhibited racists tendencies since he first announced his candidacy for president by denouncing the “rapists and murderers” who were crossing the southern border from Mexico. If there was any doubt about his feelings towards other races and cultures, he made it clear Sunday in a tweet attacking four Democratic congresswomen, all women of color with liberal, anti-Trump agendas. He said they should go back to the “broken and crime infested places from which they came,” and solve their problems before daring to tell Americans how to run America.

The four likely targets of his tweet are Reps. Alexandria Ocasio-Cortez of New York, Ilhan Omar of Minnesota, Ayanna Pressley of Massachusetts and Rashida Tlaib of Michigan. Only Somali-born Rep. Omar is not a native American.

His tweet is being rapidly and roundly denounced by Democrats. It will be interesting to see if any Republicans have the decency to speak out against this racist attack.

We have seen numerous reports, even before this, of people of color, be they black, Middle Eastern or Hispanic, being challenged and attacked by bigots demanding to know what they are doing in “my country,” threatening them and telling them to “go back where you came from.”

The president’s tweet will only encourage more such incidents.

The president’s intemperate and insulting use of social media has become so commonplace that people hardly blink anymore about what he says. But this attack on four Congresswomen who are as duly elected as he was clearly crosses the line of decency in politics.