Phoenix (CNN) One-hundred-degree Arizona weather didn't faze supporters of President Donald Trump on Tuesday as they lined up as early as 8 a.m. local time outside the Phoenix Convention Center ahead of his rally.

"I think it's important that he knows that he is supported even though a lot of people say, 'He is not my president,'" Beth Gadzick, who was standing in line holding a Trump flag, told CNN. "I'm sorry but he IS your president, and I think it's important to be united as one country."

Beth Gadzick, from Phoenix, in line with her Trump flag. "I think it's important that trump knows he's supported." #trumprally pic.twitter.com/a77t8KQbGG

Gadzick was among the hundreds who lined up to make sure they had a good view at the rally, which takes place a day after Trump's primetime speech outlining his Afghanistan strategy . Temperatures hit triple digits in the late morning; thousands are expected to descend downtown for the evening event.

The Trump rally also comes as Arizona's two Republican senators -- John McCain and Jeff Flake -- have been outspoken critics of Trump. Flake recently wrote a book in which he compared Trump's campaign to a "late-night infomercial."

"Flake is another one like McCain, he's turned into a RINO," Gadzick said, an acronym of the expression "Republican in name only." "I'm like, he's your president, you're a Republican, you should support him."

Early in the afternoon, those who waited in line were relatively low-key; many were just trying to stay cool and chatting with one another.

Some in line speculated Trump would pardon Joe Arpaio, the controversial former Maricopa County sheriff who was convicted of contempt by a federal judge last month.

"I think he should," said 20-year-old Nick Hughes, from Litchfield Park, Arizona. Hughes was sporting a giant American flag as a cape. Hughes said he wanted to attend the rally "to show my support with all the protests going on and all this negativity."

When asked on Air Force One on the way to Arizona, White House press secretary Sarah Huckabee Sanders said no news would be made Tuesday on a would-be Arpaio pardon.

Other rally attendees wondered whether Trump would officially endorse Flake's opponent Dr. Kelli Ward, whom the President recently tweeted about. Dozens of people held Ward signs or sported pro-Ward stickers as they stood in line.

Lots of people handing out Kelli ward signs outside convention center #trumprally pic.twitter.com/Y9Iw5vbcWc — Saba Hamedy (@saba_h) August 22, 2017

At the front of the line, members of the Arizona GOP set up a table to encourage voter registration. Cinthia Love, of Scottsdale, Arizona, was among the volunteers helping sign people up.

"It's time for us to unite for the betterment of this country," Love, who was sporting bedazzled American flag gear and a necklace of an American Eagle, told CNN.

Cinthia Love of Scottsdale, AZ here with state's GOP party to register voters/organize volunteers. #trumprally pic.twitter.com/2kcWOtvGi9 — Saba Hamedy (@saba_h) August 22, 2017

Love said she hopes Trump does pardon Arpaio, who she said she believes he has "done a lot for this state." She also hopes Trump touches on health care and immigration during his speech.

Sisters Amricela Godinez, 25, and Ana Rose, 36, who are Mexican-American, came because they said they "support the President no matter what."

"I don't think he's racist," Rose said. "I think a lot of people that follow him may be, but I also think a lot of people that follow him are not."

As far as immigration goes, Rose said she thinks illegal immigration "is a problem for every country," including the US.

"You can't not have rules," she said. "Trump is our president, whether people like it or not. We support him because we support our country."

Nearby the convention center, a handful of vendors had set up shop, selling gear ranging from "I came to kick ass and covfefe" shirts to "hot chicks for Trump" buttons.

One of the several swag stands #trumprally. One employee tells me the $5 tank top is most popular. Peep the #covfefe one pic.twitter.com/SWFb70KnEL — Saba Hamedy (@saba_h) August 22, 2017

"I knew it was going to be crazy," My Campaign Wear employee Codi Herrera, of Mesa, Arizona, told CNN. "We've been following Trump since he announced his candidacy. It's our busiest time."

Some businesses and schools closed early in anticipation of the rally and counter protests.

As supporters waited for the convention doors to open at 4 p.m. local time, others in Phoenix geared up to protest.

Almost a dozen protests -- organized by a handful of various progressives and anti-bigotry groups -- were scheduled for the afternoon.

Democrats in Arizona, including Phoenix Mayor Greg Stanton, are criticizing Trump for even visiting the state -- particularly for a campaign-style rally, following the violence at the "Unite the Right" rally in Charlottesville, Virginia, last weekend. The protest led to the death of counterprotester Heather Heyer, and two police officers were killed in a helicopter crash monitoring the protests.

The Trump rally kicks off at 7 p.m. local time, 10 p.m. ET.