Trump's Republican administration alleges the ban violates the Constitution's Second Amendment right to bear arms.
Wisconsin has a number of firearm-related laws in effect that limit access to children and individuals with a history of violence.
It's the first solo interview since she was selected as the Democratic nominee for president.
President Joe Biden has repeatedly pledged to not pardon his son, including in an interview with "World News Tonight" anchor David Muir.
Vice President Kamala Harris has a busy schedule during her visit to Houston. This comes amid an intensifying presidential campaign since President Joe Biden withdrew and gave her his support 10 days ago.
"The Attorney General relied upon the exact same authority to appoint the Special Counsel in both the Trump and Biden matters, and both appointments are invalid for the same reason," attorneys for Biden argued in the filings.