The president said he was "alarmed by new calls to adopt socialism in our country."
"How can a president of the United States give a State of the Union speech and not mention climate change?" asked Senator Bernie Sanders.
A recent CNN poll showed that 45 percent of Americans had never heard of Georgia Democrat Stacey Abrams.
A top aide to Nancy Pelosi cites "stakeholder" objections and "implementation challenges" to argue against single-payer plans such as "Medicare for All" to health insurance giant Blue Cross Blue Shield.
Companies largely spent their savings on stock buybacks, benefiting shareholders instead of boosting wages.
Charles Blow and Steve Cortes went head-to-head on CNN Monday.
"Today, we say to Donald Trump: We are not going back to more bigotry, discrimination and division," the Vermont senator said.
"The way our economies are organized means wealth is increasingly and unfairly concentrated among a privileged few while millions of people are barely subsisting," said Oxfam's director of campaigns and policy, Matthew Spencer.
"You are the nominee to be head of the Environmental Protection Agency. You just, in your opening statement, did not mention the words 'climate change,'" said Sanders.
"To the women on my 2016 campaign who were harassed or mistreated, thank you, from the bottom of my heart, for speaking out. I apologize," Sanders tweeted.
Independent Senator Bernie Sanders of Vermont delivered his own remarks live on various social media platforms following Trump's Oval Office address, in addition to Alexandria Ocasio-Cortez appearing on MSNBC.
"If I Run We Will Do Better Next Time," the Vermont senator said.
"Was it too male? Yes. Was it too white? Yes."
"Working families today face a lot tougher path than my family did," the Democratic senator said in a new video. "And families of color face a path that is steeper and rockier."
"Look, Beto O'Rourke isn't a young Bernie Sanders. He's more like a young Joe Biden," Brad Bannon, a Democratic strategist, told Newsweek.
Sanders has yet to declare his intention to run for president in 2020, telling reporters last week that he would "make that decision when I think it's appropriate."
The poll found 32 percent of likely caucusgoers in Iowa prefer Biden over 20 potential presidential candidates.
"Ocasio-Cortez is not the first Twitter user to mangle information from a news report," the fact-checking article wrote.
"I know a lot of people talk about this blue wave and all that stuff. I don't believe it," Sanders said in an interview that aired Monday,