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 AyotteWeek ahead: Comey firing dominates Washington GOP senators pitch Merrick Garland for FBI director Kelly Ayotte among candidates to be FBI director: report MORE (N.H.), Richard BurrRichard BurrOvernight Cybersecurity: Flynn refuses to comply with Senate subpoena | Chaffetz postpones hearing with Comey | Small biz cyber bill would cost M | New worm spotted after 'Wanna Cry' Senate Intel leaders: 'We will vigorously pursue' Flynn testimony Overnight Defense: Flynn sets up potential subpoena showdown | Trump says he never mentioned 'Israel' to Russians | Pentagon accused of overbilling for fuel MORE (N.C.), Lindsey GrahamLindsey GrahamCongress should pass the RAC Act to protect Dreamers Juan Williams: Trump morphs into Nixon This week: Congress awaits Comey testimony MORE (S.C.) and Mark KirkMark KirkThe Mideast-focused Senate letter we need to see The way forward on the Iran nuclear deal under President Trump ObamaCare repeal bill would defund Planned Parenthood 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."