In this Jan. 25, 2018, file photo Sen. Lindsey Graham, R-S.C., speaks to reporters as he arrives at the office of Sen. Susan Collins, R-Maine, who is moderating bipartisan negotiations on immigration, at the Capitol in Washington. Graham said he's glad John Bolton will serve as President Donald Trump's national security adviser going into talks with North Korea because of his "very healthy skepticism." A U.S.-North Korean summit is slated for May. (AP Photo/J. Scott Applewhite, File)
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