Sen. Joe Lieberman (I-Conn.) said the administration may have problems getting the START treaty signed last week ratified in the Senate.

Lieberman said he'd arrived at his belief on the vote tally falling short after conversations with colleagues over the congressional recess.

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"I don't believe that there will be 67 votes to ratify the START treaty unless the administration does two things," Liberman said on "Fox News Sunday." "First, commit to modernize our nuclear stockpile so as we have less nuclear weapons we know they're capable, if, God forbid, we need them; and secondly, to make absolutely clear that some of the statements by Russian President Medvedev at the signing in Prague that seem to suggest that if we continue to build the ballistic missile defense in Europe that they may pull out of this treaty -- they're just unacceptable to us.

"We need that defense to protect our allies and ourselves from Iran," Lieberman said.

President Barack ObamaBarack Hussein ObamaGeorge W. Bush honors father at benefit for hurricane victims Dem senator: ‘I miss every one of’ our last 5 presidents All five living former presidents appear at hurricane relief benefit concert MORE backed away from the controversial missile shield, a plan launched under President George W. Bush, at the beginning of his term, earning kudos from Russia but disappointment from Poland and the Czech Republic.

Lieberman stressed that as stockpiles are slashed, "we have to make darn sure that our nuclear warheads are capable, are modern. And a lot of them are decades old."

"Fox News Sunday" host Chris Wallace asked Sen. Lamar AlexanderAndrew (Lamar) Lamar AlexanderChildren’s health-care bill faces new obstacles Overnight Health Care: Schumer calls for tying ObamaCare fix to children's health insurance | Puerto Rico's water woes worsen | Dems plead for nursing home residents' right to sue Schumer calls for attaching ObamaCare fix to children's health insurance MORE (R-Tenn.) about the chances of getting nine Republican votes need in the Senate to ratify the treaty.

That depends on the administration's answers to the concerns posed by those like Lieberman, Alexander said.

"I mean, reducing the number of nuclear weapons that are deployed to 1,500 gives us plenty to blow everybody to kingdom come if that's what we choose to do," Alexander said. "But the questions are some of the ones mentioned by Senator Lieberman, and we need to take plenty of time to answer them."

Alexander also took issue with Obama's "troublesome" Nuclear Posture Statement, which declared that the U.S. wouldn't hit a non-nuclear country with nuclear weapons.

"It takes away the ambiguity about our use of nuclear power," Alexander said. "Ambiguity in foreign policy is sometimes very useful, as we've found."