House Speaker Paul Ryan said Wednesday that unifying the Republican Party around presumptive presidential nominee Donald Trump won’t be easy, and “is going to take some work.”

Ryan, R-Wis., is planning to meet with Trump Thursday morning. He huddled with his own GOP rank-and-file Wednesday morning, and told them he was in no rush to endorse Trump, but would instead seek assurances that Trump’s presidential platform won’t abandon GOP conservative principles.