ABC News October 22, 2015

Paul Ryan Announces Bid for House Speaker

Andrew Harnik/AP Photo
Rep. Paul Ryan speaks at a news conference following a House Republican meeting, Oct. 20, 2015, on Capitol Hill in Washington.

Paul Ryan announced his bid for House speaker Thursday, after saying earlier in the week he would only run to replace John Boehner if he could be a unifying candidate.

In a letter to colleagues, he wrote: "I never thought I’d be speaker. But I pledged to you that if I could be a unifying figure, then I would serve—I would go all in. After talking with so many of you, and hearing your words of encouragement, I believe we are ready to move forward as a one, united team. And I am ready and eager to be our speaker."

By Thursday afternoon, Ryan secured the support of three major groups of House Republicans, one of his preconditions for mounting a speaker bid.

House Republicans will vote for the speaker next Wednesday, followed by a full House vote on Thursday.