(CNN) - Sen. John McCain praised former Secretary of State Hillary Clinton and Vice President Joe Biden Monday, saying that Clinton would be a strong presidential candidate and that it would be a mistake to count out Biden's chances for the White House.
According to Bloomberg, McCain was speaking to reporters after a joint breakfast appearance in Chicago with Sen. Dick Durbin, D-Illinois, when the 2008 Republican presidential nominee said that "I don't think there's any doubt that Secretary Clinton would be a very strong candidate."
Clinton, who was also a Senator from New York state after leaving the White House as first lady, has remained coy about her 2016 plans, although it is expected she would quickly become the Democratic frontrunner were she to run.
"I don't think there's any doubt she has widespread support," McCain said. But there was caution along with the praise.
"Her work as secretary of state, with the exception of this issue of Benghazi – which isn't going away – I think has been outstanding. I think she would be viewed by anyone, Republican or Democrat, as a very formidable candidate for 2016."
McCain also had a few positive words for Biden, who served in the Senate for nearly four decades before becoming Vice President. The Arizona Republican called Biden a "wonderful guy" and cautioned that to "rule Joe Biden out of this mix" would be folly.