Sen. Dianne Feinstein said her concern about President Trump's ability to fulfill his role in the White House increases with each passing day.

In an interview Sunday on NBC's "Meet the Press," Feinstein questioned Trump's temperament but said it would be "premature" to consider impeachment.

"There is a kind of instability, unpredictability" to Trump, she said. "It’s one issue after the other. We’ve got major problems in the world with our allies now, in the Middle East, with North Korea. It goes on and on. And I think that this president is just precipitating more and more angst that’s going to lead to serious discord."

Feinstein said she hoped the Senate investigation into Russia's interference in the 2016 election moves quick to reach a conclusion and said she wanted top White House adviser Jared Kushner, Trump's son in law, to agree to be interviewed.

"Sen. Grassley, our chairman [on the Senate Intelligence Committee] and myself, we have sent a letter asking for information, he has agreed to give it," Feinstein said of Kushner.

"I think that’s very important and we will see what happened. I think there’s no question but that he is a principle in this. I don’t make any allegations because I don’t know. but I think his testimony would be very important."