Alec Baldwin's hot-and-cold political ambitions are very real, his brother Billy told CNN's Piers Morgan Tuesday evening.

Alec Baldwin has been rumored to be interested in running for New York City mayor for years but may finally be taking the plunge.

I know on one level it's very real, Billy Baldwin told Morgan. I think he's very committed and extremely bright and knowledgeable and I think he could do it and he could run. On the other hand, I'm not quite sure if he's cut from the proper cloth because it requires a lot of tolerance and a lot of patience.

At that point Morgan jumped in and pointed out that the elder Baldwin is known for being hot-headed and temperamental. Billy Baldwin retorted by saying, Let me remind you that John McCain and Rudy Giuliani are quite the same and they are very successful and highly effective politicians. Alec copped to having a volatile personality during his recent interview with Vanity Fair, according to USA Today.

Back in April Alec Baldwin told Bloomberg TV that after burning out on the political process in the past his interest has been rekindled.

Let's see what things are like in 2014. I would love to do it, Baldwin said. I would still like to consider [running] because I do a lot of this kind of work now and I wonder what it would be like if I had a staff and budget to do it.

Baldwin noted in 2011 that the ferociousness of the campaign process and his potential rivals had turned him off to the idea in the past.

I look at them and I don't really see myself in that crowd, Baldwin said on his WNYC podcast. They're like a guy on a date that you can tell he just can't wait to get his hand up your blouse before even the lights go out in the theater. They're all just so horny for it. ... I give up money and fame and position and success. I give up this wonderful life I have now in exchange for the chance to really change things? Yeah, I'm not quite sure you can anymore.

Baldwin, an outspoken liberal, declared last August that contesting the 2013 mayoral election is out of the question because of his commitment to his role as the comically outspoken Republican Jack Donaghy on NBC's 30 Rock.

Baldwin has been in the news this week because of his announcement that he'll no longer participate on Twitter. He deleted his @AlecBaldwin account, which got him into trouble recently after he pushed a photographer and referenced the Trayvon Martin killing by tweeting, I suppose if the offending paparazzi was wearing a hoodie and I shot him it would all blow over.

The 54-year old actor has never been shy about making his politics known. In May of this year he tweeted in reference to the Bush administration, You wanna go back to lying thieves in the White House who make war under false pretenses in order to make $ for their friends?

Nothing is confirmed, but New Yorkers could see a brash, left-leaning candidate trying to be the mayor of their brash, left-leaning city.