Part of the crowd at a Trump rally in Michigan started chanting "AOC sucks," referencing Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezHouse passes bill to avert shutdown Trump attacks Omar for criticizing US: 'How did you do where you came from?' The Memo: Dems face balancing act on SCOTUS fight MORE (D-N.Y.), after Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE criticized her ideas.

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“Think about the fact that every mainstream, leading Democratic contender is taking the advice of a freshman congresswoman who three weeks ago didn’t know the three branches of government,” the president's son told the crowd ahead of President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's speech. “I don’t know about you guys, but that’s pretty scary.”

After his remark, the crowd broke into the "AOC sucks" chant.

“You guys, you’re not very nice,” Trump Jr. responded. “And neither is what that policy would do to this country.”

Ahead of Trump's rally in Grand Rapids, Michigan, Don Jr. told the crowd that Alexandria Ocasio-Cortez "three weeks ago didn't know the three branches of government" pic.twitter.com/ZyFNmfIDr3 — Erika Ryan (@erikapryan) March 28, 2019

The Green New Deal legislation, introduced earlier this year by Ocasio-Cortez and Sen. Ed Markey Edward (Ed) John MarkeySchumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Democrats see fundraising spike following Ginsburg death Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy MORE (D-Mass.), sought to create an economy based on 100 percent renewable energy within a decade. It was blocked in the Senate earlier this week.