President Trump’s legal team called on the Senate Monday to “swiftly reject” the impeachment charges and acquit him, arguing that lawmakers would “permanently weaken the presidency” by removing him from office over what it characterized as policy and political differences. The president weighed in himself from Florida, where he was spending the holiday weekend, complaining that he had not been treated fairly and dismissing demands by Senator Chuck Schumer of New York, the minority leader, and other Democrats for a trial that would include witnesses and testimony that the president has so far blocked.