The nation's capital has ramped up security ahead of Biden's first State of the Union address tonight.

Up to 700 National Guard troops have been made available to assist local law enforcement, and a controversial inner-perimeter fence once again surrounds the U.S. Capitol.

The U.S. Capitol Police have also been working in tandem with local, state and federal law enforcement agencies on a "security plan to prevent any disruption to the important work of Congress," Capitol Police Chief Tom Manger said in a statement earlier this week.

-ABC News' Noah Minnie

For more live coverage of the State of the Union, head to FiveThirtyEight, which is providing updates on Biden's address as well as the Texas primary election.

"Given the current state of affairs, both foreign and domestic, tonight is a big night for the president," writes FiveThirtyEight politics reporter Alex Samuels.

Biden is expected to announce tonight that the U.S. will ban Russian carriers from its airspace, a person familiar with his remarks told ABC News.

Canada and the European Union have also issued similar bans following Russia's invasion of Ukraine.

-ABC News' Ben Gittleson

Iowa Gov. Kim Reynolds is expected to hit Biden on inflation, foreign policy and school reopenings in the GOP response to tonight's State of the Union, according to an excerpt of her speech released by Senate Minority Leader Mitch McConnell.

"Instead of moving America forward, it feels like President Biden and his party have sent us back in time to the late '70s and early '80s. When runaway inflation was hammering families, a violent crime wave was crashing on our cities, and the Soviet army was trying to redraw the world map," she said in the prepared remarks.

Keeping schools open "is only the start of the pro-parent, pro-family revolution that Republicans are leading in Iowa and states across this country," she said.

"Republicans believe that parents matter. It was true before the pandemic and has never been more important to say out loud: Parents Matter," she continued. "They have a right to know, and to have a say in, what their kids are being taught."

-ABC News' Lalee Ibssa

In an ill-timed moment, Rep. Lauren Boebert, R-Colo., shouted at the president, blaming him for the deaths of the 13 U.S. servicemembers killed in an attack at the Kabul airport in Afghanistan last summer, as Biden spoke about veterans exposed to burn pits developing "cancer that would put them in a flag-draped coffin."

"You put them in, 13 of them!" she yelled.

But her words came out just as the president was about to mention the death of his son, Beau Biden, an Iraq War veteran who died from brain cancer in 2015.

"I know," Biden began, attempting to reference Beau. But before he could get the sentence out Boebert shouted.

The members in the chamber immediately booed her.

"One of those soldiers was my son, Major Beau Biden," the president continued. "I don’t know for sure if the burn pit that he lived near, that his hooch was near in Iraq and earlier than that, in Kosovo is the cause of his brain cancer, the diseases of so many other troops. But I am committed to finding out everything we can."

Boebert later addressed the moment on Twitter, saying, “When Biden said flag draped coffins I couldn't stay silent. I told him directly he did it. He put 13 in there. Our heroic servicemen and women deserve so much better.”

-ABC News' Mariam Khan