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.
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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."