Sen. John McCainJohn Sidney McCainRubio asks Army to kick out West Point grad with pro-communist posts The VA's woes cannot be pinned on any singular administration Overnight Defense: Mattis offers support for Iran deal | McCain blocks nominees over Afghanistan strategy | Trump, Tillerson spilt raises new questions about N. Korea policy MORE (R-Ariz.) and other former colleagues praised the late Sen. Ted Kennedy (D) in an interview that aired Sunday, depicting the former Massachusetts senator as trustworthy and effective.   

"Ted always kept his word," McCain, who often publicly sparred with Kennedy, said on CBS's "Face the Nation." "The only times I saw him angry was when somebody didn't keep their word."
 
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"He dedicated his life to the institution," McCain added, noting Kennedy was an effective politician and "probably the greatest antagonist I ever had on the floor of the Senate."
 
The late lawmaker's family is preparing for the upcoming opening of the Edward M. Kennedy Institute for the U.S. Senate in Boston, which President Obama will dedicate on Monday.
 
"He was a legislator's legislator," former Sen. Olympia Snowe (R-Maine) said on CBS. 
 
"Having spent a lot of time with Teddy on a personal level, I could be in the middle of the ocean sailing with him, not another human being within miles, and you would think he was on the floor of the Senate," said former Sen. Chris Dodd (D-Conn.).
 
"He would get as wound up about a subject matter and I'd say, 'calm down, it's just the two of us here. Unless you're talking to the fish here,'" Dodd said, to laughter. 
 
McCain, who joined his current and former colleagues reflecting on the future of the Senate, said that Kennedy "brought some unique background and history that probably we may never see again."