From forging closer ties to the labor movement to shoring up his once-flimsy foreign policy credentials, the moves have provided the senator inroads into party power structures that largely shunned him in favor of Hillary Clinton last year. They’ve also empowered the progressive icon to harness his newfound political power and help Democrats fight President Donald Trump’s administration.

Sanders has been working closely with figures who are close to the party establishment he’s long railed against, like American Federation of Teachers President Randi Weingarten. And he’s been meeting with international affairs experts such as Bill Perry, a defense secretary in the administration of President Bill Clinton, around a series of speeches designed to define his international vision, one year after running a campaign heavy on domestic policy and light on the rest of the world.