Trump staunchly opposes the agreement, and his administration has rolled back a number of environmental regulations.
Trump fired off a series of tweets pushing back against the notion that he doesn't have a strategy to end what became the longest government shutdown in US history when it entered its 22nd day on Saturday. "Elections have consequences!" he declared, meaning the 2016 election in which "I promised safety and security" and, as part of that, a border wall.
Trump made the remark at a White House event welcoming Danny Burch, an oil engineer who Trump said last month was reunited with his family after 18 months in captivity in Yemen.
Trump described the initiative as a "good idea" in his message to Putin, Sullivan said.
Trump said he believed that "there is a solution" to the Korean Peninsula nuclear issue.
Trump has repeatedly said since his presidential campaign that he could have a good relationship with Putin.
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Trump's campaign has filed a barrage of lawsuits in various states. Election officials have said there is no evidence that the vote was rigged.
Trump raised the issue of US car imports with Abe at their meeting in Washington and said he wanted more investment in plants in the industrial heartland of Michigan, Pennsylvania and Ohio.
Trump's remarks came as his National Security Adviser John Bolton was heading to Russia on Saturday.
Trump stopped separating families last month following public outrage and court challenges.