A senator who supports the bill left the meeting at the White House with a sense that the president did not have a grasp of some basic elements of the Senate plan — and seemed especially confused when a moderate Republican complained that opponents of the bill would cast it as a massive tax break for the wealthy, according to an aide who received a detailed readout of the exchange.

Mr. Trump said he planned to tackle tax reform later, ignoring the repeal’s tax implications, the staff member added.
After the meeting, Mr. Trump played the role of cheerleader on Twitter, encouraging his weary Republican allies to keep working.

“I just finished a great meeting with the Republican Senators concerning HealthCare,” he wrote. “They really want to get it right, unlike OCare!”