In an attack on Joseph R. Biden’s environmental platform during the debate on Thursday, President Trump invoked the policies of four other politicians.
“If you look at his plan, his environmental plan, you know who developed it?” Mr. Trump said. “A.O.C. plus three. They know nothing about the climate.”
Mr. Trump seemed to be referring to four Democratic congresswomen of color whom he has repeatedly singled out for attacks: Representatives Alexandria Ocasio-Cortez of New York, Ilhan Omar of Minnesota, Ayanna S. Pressley of Massachusetts and Rashida Tlaib of Michigan.
The congresswomen were quick to respond on social media. “It’s actually AOC plus 115,” Ms. Ocasio-Cortez said in a tweet, “because that’s how many House and Senate members have co-sponsored the most ambitious climate legislation in American history.”
She was referring to the Green New Deal, a proposal she introduced with Senator Edward J. Markey of Massachusetts last year. It calls on the federal government to wean the United States from fossil fuels and curb planet-warming greenhouse gas emissions; it also aims to guarantee new high-paying jobs in clean energy industries.
All four congresswomen responded to Mr. Trump on Twitter, as did many of their supporters.
“AOC +3? Hate to break it to you, but it’s about to be a lot more than 3,” wrote Cori Bush, an activist in St. Louis, Mo., who toppled a veteran Democratic congressman in an August primary and is likely headed to the House of Representatives.
Mr. Biden has said that he does not support the Green New Deal, but his website calls it a “crucial framework.” Mr. Trump has repeatedly tried to convince voters that Mr. Biden is either a secret socialist or a liberal pawn, and he has often zeroed in on Ms. Ocasio-Cortez as a symbol of the progressive left.
“If we’ve been identified as public enemy #1 to the worst president in modern history and an entire party of his sycophants,” Ms. Ocasio-Cortez said in a tweet on Friday, “then we must be doing something right.”