But all are American citizens.
Trump bragged about the attendance at the rally in Greenville, North Carolina, which his aides falsely claimed attracted 20,000 supporters when the Williams Arena can only hold less than half that number.
But his ugly attacks reflected in "Send her back" chant is also triggering a powerful reaction among liberals and better-educated moderate voters.
The approach has seen Biden condemning Trump's attacks on the congresswomen as racist, another sign the Republican president is "tearing the soul out of this country", Biden said on Wednesday in Council Bluffs, Iowa.
The quartet - all USA citizens and all but one born in America - openly call for Trump's impeachment and accuse him of enflaming racial and ethnic tensions. The Democratic-led House voted Tuesday to condemn Trump's tweets as racist. Instead, he praised the nearly unanimous support he won from Republican lawmakers who opposed the resolution, only four of whom voted with Democrats against him. In a tweet on Sunday, he said the four women of color should "go back and help fix the totally broken and crime infested places from which they came".
They have "a big obligation and the obligation is to love your country", he said. "I know there are a lot of people that are trying to distract us now, but I want you all to know that we are not going to let them", Omar told the crowd. "You know what? If they don't love it, tell them to leave it". African-Americans, Hispanics and other minorities account for the rest and tend to vote for Democrats. We have condemned his racist remarks.
"I believe this is about ideology", McCarthy added. "We are not frightened", she told a cheering crowd that greeted her like a local hero at the Minneapolis-St. She is the mother of two daughters and a son, ranging in age from 7 to 15.
A Somali blog accused her of marrying her brother and of being a bigamist. The U.S. Department of Justice previously named CAIR as an unindicted co-conspirator in funneling millions of dollars to Hamas.
U.S. President Donald Trump renewed his criticism of four minority women lawmakers on Friday, saying that they had said awful things about the United States, and defended himself from criticism over his comment that they should leave the United States if unhappy.
"I told people on my election night, in the great state of Minnesota, we don't just welcome refugees, we send them to represent us in Washington".
Omar and Tlaib became America's first Muslim congresswomen when sworn into office in January.
"He's rallying his base", said Wendy Schiller, a professor of political science at Brown University. She subsequently apologized to Jewish groups for some of her comments.
In February, she apologized for her comment, saying: "Anti-Semitism is real and I am grateful for Jewish allies and colleagues who are educating me on the painful history of anti-Semitic tropes". Neither statement named her, even though some lawmakers wanted to.
Even in the wildly divided times we live in, the issue of Trump's now-protracted racist attack has been especially contentious.
FILE - From left, U.S. Reps. Alexandria Ocasio-Cortez (D-NY), Ilhan Omar (D-MN), Rashida Tlaib (D-MI) and Ayanna Pressley (D-MA). One lawmaker went so far as to say defending the squad in light of their own behavior "makes people's skin crawl".
Last weekend he ignited the firestorm by tweeting the four should "go back" to where they came from if they do not like the United States.
While giving the keynote speech at a CAIR fundraising banquet, Omar dismissively described the September 11 terrorist attacks as an event where "some people did something". "I didn't like that they did it, and I started speaking quickly".