President Trump’s legal team on Sunday previewed what will be the meat of their forthcoming defense this week by saying that even if all the allegations Democrats laid out last week were true, they would still fall short of “impeachable” offenses under the U.S. Constitution. After House Democrats got their chance to make the case against Mr. Trump last week, the focus now turns to the defense as Republicans eye an end to a Senate impeachment trial that could see a vote to acquit the president by the end of the week. “Even if the factual allegations are true —...