He carried Michigan in 2016, needs to win it again in 2020 and can expect supporters in the western part of the state to provide an enthusiastic endorsement of his claim that he was fully exonerated of allegations of collusion and obstruction of justice by the special counsel, Robert S. Mueller III. In fact, he was explicitly not exonerated of the obstruction charges, according to Attorney General William P. Barr’s summary of the investigation by Mr. Mueller.

“This president seems to be operating on ‘how do I make my smaller supporters more intensified’ as opposed to ‘how do I get more supporters?’” said Matthew Dowd, a former top political adviser to President George W. Bush. “He’s using the power of the presidency, instead of trying to overcome division, he is trying to harden the division.”

Neither the White House nor the Trump campaign responded to questions seeking comment about his travels.

But an examination of Mr. Trump’s calendar every day since he was sworn into office, using the data compiled at factba.se, shows that the president has mainly spoken to audiences who already agree with him, with the exception of his trips responding to natural disasters.

According to factba.se, he has spent 82.5 percent of his presidency at the White House and has visited a property he owns on 224 out of 796 days, or 28.1 percent, he has been in office. He has visited 38 states, but that masks the extent to which he has concentrated his time in states that voted for him for president: nine visits to Missouri and West Virginia, eight to Texas and North Carolina, for example. Heavily Democratic Maryland, for instance, is one of his most frequently visited states, but that is because he travels from Andrews Air Force Base, located in the state.