President Barack Obama says years of knee-jerk GOP hostility toward him has fueled Donald Trump’s rise, arguing Thursday that Republicans have no one to blame but themselves. Trump’s GOP rivals headed into their final debate before next week’s key primaries wondering if it was already too late to stop him from claiming their party’s nomination. Relishing the opportunity to ridicule what he called the GOP “circus,” Obama sought to tie Trump to his primary election opponents by claiming they see eye to eye on the issues — even if the flamboyant billionaire puts on a more provocative act. The president...