The presidential hopeful, a democrat, made her first appearance on The Tonight Show since Fallon took over Wednesday night to discuss her campaign, e-mail scandal, celebrity meetings and her opponents. Meanwhile, Trump and his republican competitors squared off in the second GOP debate in California.
Before the interview portion of her Tonight Show debut, Clinton agreed to a live phone conversation with Trump, played by the 40-year-old host. "I haven't seen you since my last wedding," fake Trump asserted at the beginning of the call.
"Well, I'm sure I'll see you at the next one," Clinton said.
Throughout the conversation, the former Secretary of State appeared relaxed while also shooting to hit major campaign topics including women's rights and immigration.
"Next question: immigration. Wall or giant wall?" Fallon asked as Trump.
"C'mon Donald America was built by people who came here and they worked their hearts out for a better life and, that's what many immigrants are doing today," Clinton said. "Their dream is to become American citizens."
Clinton also joked about topics she usually omits during her campaign trail, including liberal opponent Bernie Sanders.
"Do you have any idea what it's like to work so hard for something, to be so close to getting it, then someone pops out of nowhere and tries to take it all away?" she asked the fake Trump.
"Are you talking about Bernie Sanders?" he said. "I hate to say this but I think he's losing his hair."
During the actual interview -- done by the real Fallon -- Clinton said Trump will last as long as he wants to last during the presidential race. "I think that he's gonna go as long as he wants to go and more power to him," she said. "I mean, that is one of the great things about this country."
When it came to her recent email scandal, which consisted of her using her private email account to discuss potentially classified information during her time as secretary of state, Clinton said she's "trying to be as transparent as possible."
"It's a little hard to explain," she continued, "but sometimes different government agencies argue about what should or shouldn't be what's called classified...It wasn't at the time, and the stuff that's in it, I think it's really boring people, which kind of hurts my feelings."