During an appearance Monday on "The Tonight Show starring Jimmy Fallon," Donald Trump claimed he hasn't "even started" going after Hillary Clinton .
Trump said that Hillary is "having a tough time" against Bernie Sanders, whom called"some guy".
Trump believes Sanders should be "easy to beat." Trump said former President Bill Clinton is a "charming guy," but he added "time will tell" whether Bill Clinton is a liability to her on the campaign trial.
"I think she'll win [the Democratic nomination], I guess, but she's got the email problem, she got a big problem with emails and we'll see what happens," Trump said. "She certainly has a race that's a lot different than people thought."
"She came out with a little bit of statement about me, and then I came out with a very big statement about her and Bill, and she's not talking about me all of a sudden," Trump said to laughs from the audience.
During the opening monologue Fallon joked, "Security is tight. The Secret Service just built a giant wall around the building, and we had to pay for it."