A group of Senate Republicans is slamming President Obama as having failed to respond to Iran's ballistic missile tests. 

"A continued failure of the administration to impose consequences on Tehran for its ballistic missile tests... will confirm the dangerous perception of the regime in Iran that it can ignore its obligations with impunity and the Obama administration will do nothing," Republican Sens. Kelly AyotteKelly Ann AyotteAudit finds US Defense Department wasted hundreds of millions of taxpayer dollars US sends A-10 squadron to Afghanistan for first time in three years No, the US did not spend million on a gas station in Afghanistan MORE (N.H.), Richard BurrRichard Mauze BurrOvernight Finance: Senate rejects Trump immigration plan | U.S. Bancorp to pay 0M in fines for lacking money laundering protections | Cryptocurrency market overcharges users | Prudential fights to loosen oversight Senators introduce bill to help businesses with trade complaints Our intelligence chiefs just want to tell the truth about national security MORE (N.C.), Lindsey GrahamLindsey Olin GrahamCongress punts fight over Dreamers to March Pence tours Rio Grande between US and Mexico GOP looks for Plan B after failure of immigration measures MORE (S.C.) and Mark KirkMark Steven KirkHigh stakes as Trump heads to Hill Five things to watch for at Trump-Senate GOP meeting Giffords, Scalise highlight party differences on guns MORE (Ill.) said on Monday. 
 
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Obama is under pressure from both parties to take a firm line in response to Tehran's two ballistic missile tests late last year. 
 
The Republican senators said the administration should roll out a "strong set of sanctions" and refrain from lifting sanctions against Iran under a separate nuclear agreement until Iran ends any military dimensions to the program. 
 
While the administration, and key Democrats, have argued that the missile tests are separate from the nuclear agreement, Republicans argue that the two are inextricably linked because the missiles could potentially carry a nuclear warhead. 
 
Ayotte introduced legislation last month that would block the Obama administration from lifting sanctions, which could threaten the nuclear pact.
 
The administration had been expected to announce sanctions against Iranian individuals and companies involved in missile development, but has walked that back. 
 
White House press secretary Josh Earnest told reporters earlier Monday that new sanctions have been "considered" by the Treasury Department. 
 
"This is an option that has been on the table for some time," he said. "Ultimately we will impose those financial penalties, we will impose those sanctions, at a time and place of our choosing."