Speaker Paul RyanPaul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE on Thursday said he was "very encouraged" by his meeting with Donald TrumpDonald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE, shortly after the meeting wrapped up.

"I think we had a very encouraging meeting," he said during his weekly press conference.

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Ryan said it is no secret that he and the presumptive presidential nominee have their differences.

He added that the meeting went well, but that the process will take time. 

"The question is what is it we need to do to unify the Republican party," Ryan said. "We had a very good and encouraging productive conversation on just how to do that."

The House Speaker said he and Trump discussed the core principles that "tie us all together," referencing the Constitution and the separation of powers. 

He said they also talked about issues such as the Supreme Court.

"I was very encouraged with what I heard from Donald Trump today," Ryan said. "I do believe that we are now planting the seeds to get ourselves unified to bridge the gaps and differences."

"From here, we are going to go deeper into the policy areas to see where that common ground is and how we can make sure that we operating off these same core principles."

Ryan last week said he was "just not ready" to endorse the standard-bearer.

In a joint statement released after the meeting, Ryan and Trump signaled unity, saying they had a "great conversation" and were honest over their "few differences." 

The statement said they plan to continue to have discussions and are "totally committed" to working together.

—Updated at 11:50 a.m.