[Berman:] I told you Iowa was just around the corner.
[Camerota:] You've been saying that for a year, but, yes.
[Berman:] Right. It is now
[Camerota:] It's now official.
[Berman:] It's now less than a month away until the Iowa caucuses. And the heightened tensions with Iran are now front and center, also impeachment in the middle of this all. CNN's Arlette Saenz has the very latest.
[Arlette Saenz, Cnn Political Reporter:] With the Iowa caucuses rapidly approaching, the 2020 Democratic candidates now have their focus on two pressing issues, Iran and impeachment. This afternoon, former Vice President Joe Biden will deliver a statement about the escalating situation in Iran after condemning President Trump's idea to attack cultural sites as a war crime.
[Joe Biden , Presidential Candidate:] Internationally it's listed as that. It's not making it up. I don't think he knows what he's talking about, quite frankly.
[Saenz:] Biden highlighting his decades of experience and foreign policy record.
[Biden:] It's not to suggest I haven't made mistakes in my career, but I will put my record against anyone in public life in terms of foreign policy.
[Saenz:] But his vote for authorizing the war in Iraq in 2002, a point of contention for Senator Bernie Sanders, who voted against it.
[Sen. Bernie Sanders , Presidential Candidate:] And I just don't think that that kind of record is going to bring forth the energy that we need to defeat Trump.
[Saenz:] Sanders strongly blasting the president's decision to call a strike to kill Iran's top military leader.
[Sanders:] I think it was an assassination. I think it was in violation of international law. This guy was sitting was a bad news guy, but he was a ranking official of the Iranian government.
[Saenz:] Senator Elizabeth Warren also questioning the president's moves.
[Sen. Elizabeth Warren , Presidential Candidate:] This is not making a America safer. This is moving us closer to the very edge of war. Americans don't want a war with Iran.
[Saenz:] For Pete Buttigieg, the possibility of war is personal, after serving in the military in Afghanistan.
[Pete Buttigieg , Presidential Candidate:] Having known what it's like to be in the inside of one of those airplanes, you need to be able to trust that everybody up your chain of command has thought through what's ahead. And we're just not seeing a lot of indications of that.
[Saenz:] But with the timing of Trump's Senate impeachment trial in limbo, some candidates may run into an obstacle in the final stretch before the Iowa caucuses. The five senators running for president may need to return to Washington to be jurors in that trial. But for now, Senator Amy Klobuchar is focusing her attention on Wednesday's Senate briefing on Iran.
[Sen. Amy Klobuchar , Presidential Candidate:] Right now the evidence to me is not there that they should have reacted in this way, with such major repercussions, but let's see what the evidence is in a classified setting.
[Saenz:] Also on the campaign trail, Elizabeth Warren picked up an endorsement from her former rival, Julian Castro. They'll campaign together in Brooklyn tonight with the Iowa caucuses just 27 days away.
[Camerota:] Arlette, thank you very much. Really interesting to hear everybody's perspectives.
[Berman:] So, with Iran now vowing harsh revenge against the United States, where are U.S. troops most vulnerable? We will look at the map with a retired U.S. Army general. We'll get a sense of the greatest threats.