Today on Fox News Sunday, Senator Joe Lieberman (I-CT) joined Chris Wallace to talk about the most pressing political headlines. There is a new report today by Iran claiming that they have reverse engineered the United States spy drone that crashed last year and have begun duplicating it to use against the U.S.

As a senior member of the Senate Arms Services Committee, Lieberman said he hasn’t been briefed yet, however he’s skeptical that this is a significant military threat. “There’s a history here of Iranian bluster, particularly now when they’re on the defensive because of our economic sanctions against them. But look it was not goof the U.S. when that drone went down in Iran … I don’t have confidence at this point that they’re really able make a copy of it.”

Regarding the Secret Service prostitution scandal in Colombia

, Lieberman says he takes this very seriously. “They’re charged with the protection of the life president and vice president of the United State and their families. … History is full of cases where enemies have compromised people in security or intelligence positions with sex.”

Wallace asked if there was any evidence that these women had access to classified information. Lieberman said from everything he’s heard so far there is no evidence that information was compromised, but, “If Secret Service gets the reputation that when they’re off duty, not when they’re on duty, when they’re on assignment and off duty, they’re going to be acting like a bunch of college kids on spring weekend, then people who are hostile to the U.S., people who may actually want to attack the president of the United States may begin to take advantage of that vulnerability.”

He said he’s begun an investigation of not just this particular instance but also a broader investigation into whether this is an exception or a pattern of misconduct among agents while they’re on assignment and off duty. If it is found to be a repeated behavior, Lieberman says he will follow up on why wasn’t it noticed prior to this instance and what’s going to be done to ensure it never happens again.

Check out the interview below to see what Sen. Lieberman has to say about the GSA controversy and why he says 'the buck stops at the president's desk'!