Trump's appointments to the Supreme Court and lower federal courts have themselves spurred charges that the courts are becoming more politicized. As the justice widely seen as closest to the court's middle, Roberts could determine the outcome of high-profile cases that split the court.
Trump has also been involved in disputes with London Mayor Sadiq Khan, who has been outspoken in his position to Trump being afforded a state visit.
Trump's recognition of Jerusalem as Israel's capital on Dec 6 and the announcement that the US would move its embassy from Tel Aviv to Jerusalem has sparked a series of protests around the world, causing several deaths and thousands of injuries in the Israeli occupied Palestinian territories. In this sense, Trump and Haley both have had bloods on their hands.
Trump's thinking on trade is largely misguided, said Yukon Huang, a senior fellow in the Asia program at the Carnegie Endowment for International Peace.
Trump's tweets sparked a row between the White House and May, who said Trump was "wrong" to re-tweet material from a group she described as spreading "hateful narratives."
Trump, however, also said the summit might not happen.
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Trump greeted Kim and shook hands with him right above the military demarcation line (MDL), marked by a low concrete slab.
Trump told reporters at the White House on Friday that he was still open to holding a summit.
Trump made the comments after US Attorney General William Barr earlier vowed to carry on the Epstein investigation even after the financier's death and ordered the Justice Department's inspector general to look into the matter.
Trump traveled to California on Monday to inspect the situation there, denying the role of climate change in the wildfire that blocked the sun and turned the sky red.