Former Democratic presidential nominee Hillary Clinton said Tuesday she supported President Trump's military strike in Syria last month, but said "it's too soon to really tell" if it really worked.

In an onstage interview Tuesday with CNN's Christiane Amanpour, Clinton said: "Yes, I did support it. I didn't publicly support it because there was, you know, that wasn't my role, but I did support it."

Asked if it worked, Clinton said: "I think it's too soon to really tell."

"I am not convinced that it really made much of a difference," she said. "I don't know what kind of potentially, you know, backroom deals were made with the Russians. I mean, we later learned that the Russians and the Syrians moved jets off the runway, that the Russians may have been given a heads up before our own congress was. I think there's a lot we really don't fully know about what was part of that strike."

Clinton said she's recently been busy writing a book about the election.

"I am writing a book and it's a painful process reliving the campaign as you might guess," she said.