Democratic Presidential candidate Joe BidenJoe BidenNYT to fight White House’s withholdment of emails about Ukraine aid freezeKrystal Ball: ‘Doesn’t hold up’ to say Castro failed to gain traction due to raceWarren announces support for new North American trade pactMORE ripped President TrumpDonald John Trump Trump asks New York judge to dismiss rape allegation caseNYT to fight White House’s withholdment of emails about Ukraine aid freezeGabbard blasts Iran strike: ‘Trump’s actions are an act of war’MORE’s tweets on Iran as “dangerous and irresponsible” on Saturday night after Trump threatened to hit Iranian sites if there is retaliation for Qassem Soleimani’s killing. 

“When he makes statements like that, it just seems to me to be he’s going off on a tweet storm on his own, and it’s incredibly dangerous and irresponsible,” Biden told reporters, according to a video posted to Twitter by CBS News’s Bo Erickson. 

“I have no idea whether he’s coordinated with any of our allies. I have no idea whether or not he has the support of his own generals,” the former vice president added. “This is a guy who seems to be unmoored.”

WATCH: @JoeBiden rips @realDonaldTrump’s tweets on Iran and calls them incredibly dangerous and irresponsible @CBSNewspic.twitter.com/GWv0THOHfH

Bo Erickson CBS (@BoKnowsNews) January 5, 2020

Earlier Saturday, Trump said he was prepared to strike 52 unspecified Iranian sites “very fast and very hard” if Iran retaliates for the death of Soleimani, who was one of Iran’s top generals. 

“Let this serve as a WARNING that if Iran strikes any Americans, or American assets, we have targeted 52 Iranian sites… some at a very high level & important to Iran & the Iranian culture, and those targets, and Iran itself, WILL BE HIT VERY FAST AND VERY HARD. The USA wants no more threats!” Trump tweeted. 

The president this week directed a strike that killed Soleimani. He has defended the action, saying it was done to “stop a war.”

Democrats, however, have criticized the strike, calling it an escalation that could provoke violence. 

Iran has threatened “harsh retaliation” for the strike.  

Biden is among the frontrunners in the 2020 race for the Democratic presidential nomination.