Ocasio-Cortez has been a prominent voice on social media and has even provided advice to fellow Democrats on how to use their own platforms.
Barr had invited Ocasio-Cortez to come to his district in eastern and central Kentucky to learn how her Green New Deal could impact his constituents.
Ocasio-Cortez also spoke highly of Sanders, who she campaigned for in 2016.
"The top tip, I think, is really to be yourself and to really write your own tweets so that people know it's you talking", Ocasio-Cortez told ABC News after emerging from class in January. I think that, if a window opens and I feel like I can do well, and do better, and offer more to people, then I would consider it.
Yet Omar's comments about USA political backing for Israel being fuelled by money from a pro-Israel lobbying group led to criticism from both sides of the political aisle.
Alexandria Ocasio-Cortez may seem undefeated when it comes to laying waste to trolls on Twitter. "I think it's certainly on the table, and I think it's something that can be discussed", she said.
"But I think that we need to expand what those policy conversations are because I would-as just a citizen of this country-I would be very concerned if Trump started really pursuing more and more and more increasingly unsafe policies, and everyone just standing aside saying this is normal", she said.
Ocasio-Cortez drew an implied analogy to US policy on the southern border, where Trump last week implied that the policy of detaining immigrants and removing their children was an effective deterrent to illegal immigration.
In a letter hand-delivered to Ocasio-Cortez's office Friday, Republican Rep. Andy Barr of Kentucky told the congresswoman he "was greatly trouble to hear of your comments about our colleague and patriot to our country". "We have the grounds to do it", she said.
Known by her initials, AOC, the left-wing American politician has gained a considerable fanbase since being elected as a Democrat to represent NY in the 2018 mid-term elections.