They were either unaware of his whirlwind tour or found that his uncharacteristically diplomatic demeanour during a visit with Mexican President Enrique Pena Nieto in Mexico City was overshadowed by his return to his usual fiery rhetoric when back on US soil a few hours later.
"I hope that he does really, in his heart, have a little more compassion than what he spouts out," said Dave Mitchell, 58, of Surprise, Arizona, a self-described moderate who says he is begrudgingly planning to vote for Trump.
Arizona, a reliably Republican state in past elections, could prove to be a close race in the battle between Trump and Democratic rival Hillary Clinton. The Reuters/Ipsos States of the Nation project, which is based on a national online opinion poll, found Trump leading Clinton by only 3 percentage points in the state as of August 26.
Trump's last-minute visit on Wednesday to Mexico was designed to appeal to moderate voters, including those most affected by illegal immigration, who are worried that the real estate mogul and former reality TV star lacks the temperament to engage in international diplomacy.
Pena Nieto had on Wednesday afternoon hailed the impromptu meeting with Trump as "open and constructive." Trump later referred to the Mexican leader as his friend and a "wonderful" president.
But only hours after leaving Mexico, Trump delivered a speech in Phoenix, Arizona, in which he again emphasised his desire to build a wall along the southern border and deport millions of people who had entered the United States illegally.
Pena Nieto later rebuked Trump as a threat to his country.
Trump launched his campaign last year on a promise to build a wall along the Mexican border to stop illegal immigration, and accused Mexico of sending rapists and drug dealers into the United States.
Clinton's campaign announced on Wednesday night it would begin running TV commercials in Arizona, a sign it sees a chance of winning there on November 8.


