Merchandise abounds outside of the convention center, with official RNC-branded souvenirs sold inside the Fiserv Forum. The signature red "MAGA" hat is sold at all of them, but all of the vendors have slightly different stock.

A vendor outside of the main security line was selling shirts with the now-iconic photo after the assassination attempt of former President Donald Trump, while another inside of the security perimeter sold T-shirts that declared "I'm voting for the felon."

The official RNC store features T-shirts with Trump's mugshot along with more niche merchandise such as Christmas ornaments.

-ABC News' Diana Paulsen

Vivek Ramaswamy, a high-profile businessman and former 2024 Republican presidential primary candidate, told reporters in a brief gaggle on Tuesday morning that he plans on striking themes of unity during his remarks he's set to give on Tuesday night at the convention's main session.

Ramaswamy said his focus on national unity might come as a surprise to some viewers and listeners.

“It may not be the message that everyone expects to hear from me, but I do think that this message of national unity is important,” he said.

He added that he strives for an "authentic" version of unity.

“I don't want to fake national unity -- not some astroturf, artificial kind -- but the real thing. Authentic national unity, not one that pretends that we agree on everything, because we don't. But that we are the country where we can still disagree like hell and still have dinner at the end of it.”

-ABC News' Steven Portnoy

Wisconsin voters spoke with ABC News about what issues matter most to them this election as the RNC happens in their backyard. They include inflation, border, health care and democracy.

Republican voter Valori Schmidt, 68 and a retired teacher, said the border mattered most to her.

"We cannot sustain America on this massive influx of immigrants," she said. "And then they're everywhere that we don't know. I want -- I love the American dream. I love immigration coming in the correct door, the correct way."

Read more about what Schmidt and other votes said here.

-ABC News' Alexandra Hutzler

Former President Donald Trump pick of Sen. J.D. Vance as his vice president is helping set the course of the Republican Party's future.

With the selection of Vance as his running mate, it give the first-term senator a massive platform to help steer the party at the end of a hypothetical Trump term in 2029 -- and even a leg up if he were to then seek the top job himself.

"Trump wants to make sure MAGA outlives him," said Dan Eberhart, a Trump donor, referencing the "Make America Great Again" mantra that the former president popularized. "I think that was a big part of the choice."

Read more of the analysis here.

-ABC News' Tal Axelrod