House Speaker Paul Ryan and presumptive GOP presidential nominee Donald Trump are to meet this coming Thursday in Washington in hopes of ironing their differences, but it may take more than just one meeting for the two to iron out the differences in their views.Ryan has said he is concerned about Trump's ability to champion the principles "all conservative and all Republicans share," but Trump retorted he's "not ready to support Speaker Ryan's agenda," either, leaving the two at a possible impasse.The Hill broke down 10 policy issues where Trump and Ryan are at odds:Trump, just after the San Bernardino, Calif. terror attacks, called for a "total and complete shutdown" of Muslims coming into the United States.Ryan at that point rebuked him, saying that such a ban is unconstitutional and "not conservatism."But Trump has refused to back down, and as late as Wednesday was saying that he didn't care if the ban hurts him, and the next day, Paul said he was not yet ready to endorse him.Trump recently admitted to NBC's Savannah Guthrie that he favors raising taxes, even for himself, while Ryan has been pushing for tax reform and cuts, and believes that hikes are the "last thing our country needs."Ryan supports the Trans-Pacific Partnership, and helped write a fast-track bill to get it pushed through. He also praised the TPP in a Wall Street Journal op-ed written with Texas Sen. Ted Cruz, who dropped his own bid for the nomination.Trump, though, says he wants the TPP eliminated because he says it will make the nation's trade deficit with China worse.Both Ryan and Trump have gone back and forth on the issue, but now Trump says he considers opening relations "fine."Ryan, though, complains that President Barack Obama's call to open the country back up "legitimizes a tyrannical dictatorship" of brothers Fidel and Raul Castro.Both call to deny federal funds to the organization. However, Trump, who has supported broad abortion rights in the past, still noted in February there are "millions of women" who the agency has helped through health care screenings.Ryan, though, backs a panel that is probing charges that Planned Parenthood made money through the sale of fetal tissue and said that Republicans are moving forward on "multiple fronts" on the organization.Trump has not backed down on his stance on illegal immigration since the day he began his race for the White House, while Ryan back bills granting legal status for some illegal immigrants and said last week that he favors a "solution that doesn't involve mass deportation."Ryan opposes a raise, saying that such a move would result in a half-million job losses nationally, while Trump has softened on the issue, telling CNN that "you have to have something you can live on."Ryan opposes the measure, including fighting with legislation a 2005 Supreme Court decision that allowed New London, Connecticut officials to seize private land and selling it.Trump, though, has used eminent domain to build his business interests and calls it a "wonderful" tool for both public and private enterprise.Ryan favors raising the eligibility age while shifting retirement funds into private accounts and lowering benefits paid out to seniors with higher incomes. Trump, though, rejects plans to cut entitlement benefits.: Ryan favors a ban on Medicare from negotiating with drug companies, but Trump says the government could help save billions of dollars through bulk medication purchases.