In an interview with Jake Tapper, Rep. Adam Schiff (D-CA) reacted to Rep. Jackie Speier (D-CA)'s tweeting it's "time to invoke the 25th Amendment" because President Trump is mentally unstable. The tweet received 24,000 likes and more than 10,000 retweets. "POTUS is showing signs of erratic behavior and mental instability that place the country in grave danger. Time to invoke the 25th Amendment," Speier tweeted last week. From Sunday's broadcast of CNN's State of the Union: TAPPER: After President Trump's comments appearing to equate white supremacists and the counterprotesters, your fellow Democrat on the House Intelligence Committee, Jackie Speier, tweeted, quote, POTUS is showing signs of erratic behavior and mental instability that places the country in grave danger. Time to invoke the 25th amendment — that's the amendment that would allow the removal of the president. Do you agree that President Trump is mentally unstable? SCHIFF: Well, I certainly think that there's an issue with the president's capability. There's some attribute of his character that makes him seemingly incapable of introspection and a broad understanding of what the country really needs. And I think it's a question that people are asking, you know, what is going on with this president? What could explain this kind of behavior? You know, it began at the very beginning, Jake. I remember when he had won the election and, within days, seemed to suggest that the only reason he didn't win the popular vote was that millions of people illegally came to the country and voted. And I thought to myself, oh, my god, this man is not only going to not grow with the job, but is willing to state things that are just patently untrue. I'm convinced if you took somebody off the street of America and said you've just become president, but here is the deal, you didn't win the popular vote, they would have the common sense to say, look, I'm going to do everything I can to win over everyone. I realize that many people, indeed, most people, didn't vote for me. But he didn't do that. He's not capable of doing that. And I don't understand why. But I do recognize what a serious problem it is. And I think more than when I say it or when Jackie Speier says it, the fact that Bob Corker now says things along the same lines, shows a broadening recognition that there are some serious issues with our president that aren't going to go away, that aren't going to get better. And indeed, with the pressures of the job, may very well get worse. And I think for that reason, at a minimum, we need the very best people around him in the White House, and that means not people like Bannon, not people like Miller, not people like Gorka, but rather some more adults in the room. TAPPER: It sounds like you're saying that you don't disagree with Jackie Speier, who said that President Trump is showing signs of erratic behavior, mental instability. So it sounds like you're not disagreeing with that. What about the 25th amendment part, which would call for the removal of the president? Are you — do you agree with that? SCHIFF: You know, I don't think we're at a point of thinking about the 25th amendment. For one thing, this is something that the vice president and cabinet would need to come together on. I think what the authors of that amendment principally had in mind was some kind of physical incapacitation, or serious mental illness, or a breakdown, an inability to function in office. And I think we're still far from concluding that that's the case, even though we find, many of us, his conduct anathema and there to be a serious problem here. But I don't think it, particularly at this point in time, makes a lot of sense to focus on the 25th amendment. I do think it means we have to put real constraints on this president. We have to make sure our system of checks and balances in Congress work. I think frankly the most powerful thing we could do, rather than pursue the 25th amendment at this point, is make sure that one house or the other, and ideally both, are in Democratic hands, frankly, the hands of a party not in the White House, to be a more effective check on some of the damage this president can do.