Story highlights Bernie Sanders told MSNBC Friday he will vote for Hillary Clinton for president in November

Sanders has not yet formally conceded the race for the Democratic presidential nomination

(CNN) Bernie Sanders said Friday he will likely vote for Hillary Clinton for president in November, the strongest expression of support yet from the Vermont senator, but he left the door open that he could change his mind.

"In all likelihood, it will be Hillary Clinton," Sanders told CNN's Chris Cuomo on "New Day."

Sanders said he was focused on his leverage over the Democratic party platform.

"My job right now as a candidate is to fight to make sure that the Democratic Party not only has the most progressive platform in the history of the Democratic Party, but that that platform is actually implemented by elected officials," Sanders said on CNN.

He also declined to say whether the time will come that he fully endorses Clinton, saying he is waiting to see what she says about his priorities. He also would not say explicitly, when pressed by Cuomo, that she won the nomination fairly.

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