It's unusual for a House speaker, third in line to succeed the president, to turn himself into a lame duck, especially so for Ryan, a once-rising GOP star who is only 48 and was the party's vice presidential candidate in 2012. His decision fueled fresh doubts about the party's ability to fend off a Democratic wave, fed by opposition to Trump, in November. And it threw the House into a leadership battle that could end up pushing Ryan aside sooner that he intended and crush any hopes for significant legislation before the election.