Former President Barack Obama says he “could not be prouder” to congratulate President-elect Joe Biden and Vice President-elect Kamala Harris.

In a statement Saturday, Obama says Biden has “got what it takes to be President and already carries himself that way,” because he will enter the White House facing “a series of extraordinary challenges no incoming President ever has.”

Acknowledging that the election revealed the nation remains bitterly divided, Obama said, “I know he’ll do the job with the best interests of every American at heart, whether or not he had their vote.”

He adds: “I encourage every American to give him a chance and lend him your support.”

Biden served as Obama’s vice president for two terms.

House Speaker Nancy Pelosi and Senate Democratic leader Chuck Schumer jointly called President-elect Joe Biden to congratulate him on a “tremendous” victory.

That’s according to a senior Democratic aide who spoke on condition of anonymity to discuss the private conversation.

The aide described it as a “happy call.” Biden’s wife, Jill, also joined the conversation Saturday.

The aide says Pelosi and Schumer look forward to working with the new Democratic administration to achieve “great things” for the American people. The two did not get along with President Donald Trump.

Another senior Democratic aide says Schumer was celebrating on the streets of Brooklyn during the call and held up his phone so Biden could hear the crowds cheering for his “historic victory.” The aide also spoke on condition of anonymity to describe the private call.