Graham warns Trump: New Iran sanctions likely to 'fall short'

Sen. Lindsey GrahamLindsey Olin GrahamMcConnell hopes Senate impeachment trial 'not too lengthy a process' Hillicon Valley: Progressives oppose funding bill over surveillance authority | Senators call for 5G security coordinator | Facebook gets questions over location tracking | Louisiana hit by ransomware attack Prisons chief: FBI investigating whether 'criminal enterprise' played role in Epstein death MORE (R-S.C.) on Wednesday warned that President TrumpDonald John TrumpDem senator says Zelensky was 'feeling the pressure' to probe Bidens 2020 Dems slam Trump decision on West Bank settlements Trump calls latest impeachment hearings 'a great day for Republicans' MORE's plan to increase sanctions against Iran likely won't be enough to change the country's behavior.  

Graham, speaking with reporters for the first time since Trump called him out amid a scuffle on Iran, predicted that new sanctions against Iran "will fall short." 

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"The maximum pressure campaign has worked in the sense it’s crippled the regime’s economy, it’s made life difficult for the regime, but it has not changed their behavior," Graham told reporters. 

"The only conclusion I think you can reach is that the Iranians, while having been hurt by the maximum pressure campaign, have not been deterred in terms of their provocative behavior. And it’s going to take something, I think, beyond sanctions to achieve that deterrence," he added.  

Pressed if he was saying he he believed Trump's plan to ramp up sanctions would not be enough, he added: "In the past they haven't been, but time will tell. ... My belief is that additional sanctions will fall short."

Trump announced on Twitter that he had instructed Treasury Secretary Steven MnuchinSteven Terner MnuchinNegative interest rates are uncalled for in today's strong economy House passes stopgap as spending talks stall On The Money: Supreme Court temporarily blocks House subpoena of Trump financial records | Trump touts 'cordial' meeting with Fed chief | Stopgap funding measure includes census money, military pay raise MORE to “substantially” increase economic sanctions on Iran. Administration officials have blamed Iran for drone attacks on two Saudi oil sites over the weekend. 

“I have just instructed the Secretary of the Treasury to substantially increase Sanctions on the country of Iran!” Trump tweeted.

Graham's skepticism comes after Trump lashed out at him in a tweet on Tuesday night after the South Carolina Republican criticized his policy on Iran. 

Graham and Trump have fundamentally different foreign policy views. Graham is viewed as a hawk, while Trump ran in 2016 on an isolationist foreign policy. But the back-and-forth marks a rare split in their relationship after Graham went from being a vocal Trump critic in 2016 to one of his closest allies on Capitol Hill. 

Graham on Tuesday had criticized Trump’s past response to a drone incident for being insufficient. Trump had authorized a military strike on Iran in response to the downing of the drone but said he called it back after learning there would be 150 casualties. 

“The measured response by President Trump regarding the shooting down of an American drone was clearly seen by the Iranian regime as a sign of weakness,” Graham said, adding it was “imperative” that the U.S. take decisive action to deter further Iranian aggression. 

Trump fired back on Twitter, calling out Graham by name over his comments. 

"No Lindsey, it was a sign of strength that some people just don’t understand!" Trump tweeted.