Slotkin discussed the despair that many Americans are feeling and their anger over leaders who have not stood up to Trump and his administration.

"Hold your elected officials, including me, accountable. Watch how they're voting. Go to town halls and demand they take action. That's as American as apple pie," she said.

The senator also pushed Americans to organize.

"Pick just one issue you're passionate about and engage. And doomscrolling doesn't count. Join a group that cares about your issue and act. And if you can't find one, start one. Some of the most important movements in our history have come from the bottom up," she said.

Democrat Elissa Slotkin slammed Trump over last week's Oval Office dust-up between Trump, Vance and Ukraine's Volodymyr Zelenskyy, saying Ronald Reagan "must be rolling in his grave."

"We all want an end to the war in Ukraine. But Reagan understood that true strength required America to combine our military and economic might with moral clarity," she said. "And that scene in the Oval Office wasn't just a bad episode of reality TV. It's summed up Trump's whole approach to the world."

Slotkin said Trump "believes in cozying up to dictators like Vladimir Putin and kicking our friends like the Canadiens in the teeth."

Slotkin criticized DOGE and Trump for the "mindless" mass firings of federal workers, only to hire some of them back days later.

"No CEO in America could do that without being summarily fired," she said.

"Is there anyone in America who is comfortable with him and his gang of 20 year olds using their own computer servers to poke through your tax returns, your health information and your bank accounts?" Slotkin asked while delivering remarks on economic security.

While she agreed that America needs a more efficient government, she argued that there is "no oversight" with Musk's efforts.

Four sitting members of the U.S. Supreme Court are in attendance for Trump's address tonight: Chief Justice John Roberts, Justice Elena Kagan, Justice Brett Kavanaugh, and Justice Amy Coney Barrett. Retired Justice Anthony Kennedy is also present.

This is a slightly smaller showing from the court compared with recent presidential addresses to Congress as six attended in 2024, five attended in 2023, and five attended in 2022.

During Trump's first term, however, only four justices ever attended each of Trump's addresses before Congress.

Trump will shake hands with and speak before members of the Supreme Court at a time when his administration is seeking its emergency intervention in two pending cases related to his executive actions -- one involving his power to fire any employee of the executive branch for any reason, and the other involving his power to freeze foreign aid that Congress has authorized for specific programs.

To date, the Supreme Court has not yet weighed in in any meaningful way on Trump's asserted presidential powers during his second term.

– ABC News’ Devin Dwyer