Senate Republicans want to block President Obama from lifting sanctions against Iran over lingering concerns about possible military dimensions of the country's nuclear program.

Kelly Ayotte Kelly Ann AyotteBottom line Bottom line Bottom Line MORE Sen.(R-N.H.) has introduced legislation that would block lifting sanctions until after the administration handed over a wide-ranging report on military aspects of Iran's nuclear program and certified to Congress that any military-related activity tied to the program has ended.

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The proposal comes as the administration is preparing to lift sanctions against Iran as part of a deal on its nuclear program as early as January. The agreement was opposed by every Senate Republican.

As part of a possible military dimension to Iran's nuclear program, Ayotte's proposal would also require that that the administration certify that Iran has ended any "research, development, testing, or fielding" of ballistic missiles that could carry a nuclear weapon.

While the administration, and prominent Democrats, have argued that the nuclear agreement is separate from Iran's missile program, it's come under increased scrutiny in the wake of Iran missile tests since October.

Both Republicans and Democrats have pushed President Obama to take a firmer response to the missile tests, with lawmakers arguing it could signal how the administration would handle violations of the nuclear deal.

Ayotte spearheaded a letter earlier this month, which was signed by 34 of her Republican colleagues, saying that the administration shouldn't lift sanctions against Iran in the wake of the tests.