DT went on an especially viscous Twitter rant Sunday morning, which many people have called out as flat-out racist and xenophobic ... including some prominent members of the GOP like Meghan McCain and even ex-Fox News reporter Geraldo Rivera.

Here's what the Prez said ... "So interesting to see “Progressive” Democrat Congresswomen, who originally came from countries whose governments are a complete and total catastrophe, the worst, most corrupt and inept anywhere in the world (if they even have a functioning government at all), now loudly and viciously telling the people of the United States, the greatest and most powerful Nation on earth, how our government is to be run."

He went on ... "Why don’t they go back and help fix the totally broken and crime infested places from which they came. Then come back and show us how it is done. These places need your help badly, you can’t leave fast enough. I’m sure that Nancy Pelosi would be very happy to quickly work out free travel arrangements!"

While Trump did not name anyone in particular, many took his tweets to be aimed Rep. Alexandria Ocasio-Cortez, Rep. Rashida Tlaib, Rep. Ayanna Pressley and Rep. Ilhan Omar ... who've been in the news recently for ruffling feathers within the Democratic party and butting heads with Speaker Pelosi.

It sounds like these congresswomen believe the attack was meant for them too, because all of them directly responded to Trump with some choice words.

AOC fired back, writing ... "Mr. President, the country I “come from,” & the country we all swear to, is the United States. But given how you’ve destroyed our border with inhumane camps, all at a benefit to you & the corps who profit off them, you are absolutely right about the corruption laid at your feet." She went to say he can't conceive of an America that "includes us."

Reps. Omar, Tlaib and Pressley all tweeted back at 45 as well, with the latter writing ... "THIS is what racism looks like. WE are what democracy looks like. And we’re not going anywhere. Except back to DC to fight for the families you marginalize and vilify everyday."

Rep. Tlaib said, "Yo @realDonaldTrump, I am fighting corruption in OUR country. I do it every day when I hold your admin accountable as a U.S. Congresswoman."

And finally, Rep. Omar -- the only congresswoman of the bunch who was actually born in another country, but has since gained full American citizenship -- hit the point home by saying, "Mr. President, As Members of Congress, the only country we swear an oath to is the United States. Which is why we are fighting to protect it from the worst, most corrupt and inept president we have ever seen."