LAS VEGAS — Hillary Clinton painted a dire picture Wednesday of an America, both at home and abroad, in a Donald Trump presidency — a pitch crafted to fire up supporters and woo undecided voters in the campaign’s closing days.

On a day that included appearances in Florida, Nevada and Arizona, the Democratic presidential nominee said her GOP rival would create a climate where citizens “fear the future and each other.”

Clinton told a crowd at a pipe-fitters union hall here that “if you don’t fit into a very narrow category of people he can relate to, somehow you don’t have a part in Trump’s America.”

She noted Trump’s criticism of Latinos, African-Americans and some elements of the military as evidence of Trump’s plan to marginalize and divide Americans.

Trump would be “out of his depth as commander-in-chief” Clinton said, adding that he held “dangerous” ideas about nuclear weapons. She blasted his business record, noting the number of contractors and others who have sued Trump for allegedly stiffing them on payments.

Meanwhile, a Clinton spokeswoman said the campaign is increasing advertising spending in the final week of the race for the White House and contended that the FBI’s decision last week to look into more of Clinton’s emails in the final days of the election campaign only served to rally the candidate’s backers.

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Clinton continued her heavy campaign schedule Wednesday, flying from Florida to Nevada before stopping in Arizona — a state considered “in play,” although no Democrat has won there since her husband did two decades ago. In her fifth trip to Nevada since the Democratic convention, Clinton also met with labor union supporters.

With the race tightening, Clinton has concentrated on convincing voters that Trump is simply unacceptable.

Wednesday, she primarily focused on her supporters and undecided voters, urging them not to be complacent — and not to think that Trump might “be different when he becomes president.”

“Imagine it is January 20, 2017, and it is Donald Trump taking the oath of office,” Clinton told the crowd of mostly labor union members. “Someone who demeans women. Mocks the disabled. Insults Latinos . . . What would it be like to have a president who pits people against each other. What would your life be like?”

Clinton said voters who think Trump might change are off base.

“We don’t have to guess,” Clinton said. “We just have to look at everything he’s said and done . . . If you add up all the people and all the groups of the people he has insulted and demeaned, it’s well more than half of America.”

Clinton again didn’t address the decision last week by FBI Director James Comey to review emails found in an unrelated investigation and contained on a private computer owned by former New York congressman Anthony Weiner, the estranged husband of Huma Abedin, a longtime Clinton adviser.

Trump has sought to capitalize on the development.

Clinton campaign spokeswoman Jennifer Palmieri sought to bolster Clinton’s side Wednesday.

Palmieri said Comey’s Oct. 28 decision, coming so close to the Nov. 8 election, was charging up Clinton’s backers.

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“If we have seen any impact from Jim Comey’s letter, it has been a motivating factor for our supporters,” Palmieri said.

She noted that Democrats are going to boost ad buys and appearances in key states in the final six days.

“We are confident we can win these states,” Palmieri said. “But we’re not going granted . . . We’re not going to leave any money on the table.”