Donald Trump and Paul Ryan are probably the two most important Republican figures since President Obama took office.
As they seek a way to unite the GOP, they must confront their philosophical differences on key policy issues.
Ryan favors immigration reform with a path to citizenship, expanding free trade and cutting entitlements. Trump, meanwhile, favors mass deportations, rails against trade deals and has promised not to touch Social Security and Medicare.
Although they met Thursday to seek common ground, Ryan still had not endorsed the billionaire businessman.
"I was very encouraged with this meeting, but this is a process," Ryan told reporters. "It takes a little time. You don't put it together in 45 minutes."