The failed rollout of House Speaker Paul Ryan’s unpopular healthcare bill has weakened his hold on the Speakership, and could cause his replacement, says David Frum, a GOP-leaning author, a champion for pro-American immigration and labor policies, and a former speechwriter for President George W. Bush. The prediction came in an evening Tweet from Frum, who is now a columnist for The Atlantic magazine. I don’t believe Trump is strategic enough to have planned this, but the way is now clear for Ryan to be shoved aside for a Trumpist Speaker — David Frum (@davidfrum) March 13, 2017 Growing GOP...