Donald Trump endorses House Speaker Paul Ryan, ending a four-day standoff

(Alex Wong/Getty Images)

GREEN BAY, Wis. – GOP presidential nominee Donald Trump is striking a rare tone of party unity.

In addition to formally endorsing House Speaker Paul Ryan, Trump on Friday evening also threw his support behind Arizona Sen. John McCain and New Hampshire Sen. Kelly Ayotte, with whom he has sparred.

Trump says, "We have to unite."

He says that, as president, he will need a Republican Senate and House to accomplish all of the changes he wants to make.

He adds that, "This campaign is not about me or any one candidate," and says: "We will have disagreements. But we will disagree as friends and never stop working together toward victory."